General information

Diseases of hydrangea: their treatment, photos, pests and measures to combat them


Hortensia is a wonderful plant that can be grown under the open sky and in a pot, as a houseplant. But sometimes after winter it does not grow again, and does not begin to bloom - why is this happening, what is the reason for this phenomenon, and what should be done to launch these processes?

If the hydrangea does not grow after winter, most likely, its roots during the winter period were damaged by insects, fungi, or other pathogens. Hydrangea, like any plant with a healthy and normally developed root system, cannot but grow with the onset of spring. Therefore, it is necessary to remove it from the pot and inspect the roots - you may notice rot or insect pests on them.

Remove the tainted fragments, and if there are no healthy areas left, you will have to buy a new plant. If all is not lost, soak the remnants of the roots in a disinfectant solution, for example in a slightly pink solution of potassium permanganate (potassium permanganate).

Pour out the soil from the pot, wash the pot with detergent, and fill it with new soil mixture, having previously laid a layer of drainage on the bottom of the pot. Drainage in the pot is necessary. Why? After all, does hydrangea like moisture? The fact is that although hydrangea is a moisture-loving plant, it does not like stagnation of water, its roots deteriorate from this.

If the hydrangea grows after the winter, but badly, it means that a part of the roots is damaged, or she doesn’t like something in your care. What to do in these cases? Start with an inspection of the root system, and in case of detection of damaged areas remove them, and carry out the treatment of the roots, soil and pot.

After that, hydrangea should be fed with nitrogenous fertilizers - from them it will quickly begin to grow in height and gain green mass. At the beginning of budding and during flowering, the flower is fed with potash-phosphorus fertilizers.

Well, in order to create proper conditions for hydrangeas, it is necessary to know the peculiarities of caring for her - what she likes and what she does not tolerate.

The roots of the hydrangea lie immediately below the soil surface, if you plant it in a too spacious and deep pot, it will not start to grow in height until all the soil in the pot is filled with its roots. This is another answer to the question: why does hydrangea grow poorly? A pot for planting hydrangea does not have to be too spacious; a small but stable pot of unburned clay will suffice.

For planting hydrangea is better to use a special mixture with an acidic reaction, since alkaline soil for hydrangea is not the best option.

Room hydrangea will grow well in a cool room, in the summer it is carried out to fresh air, but not under the direct rays of the sun, but into a shaded place. In winter, keep in a cool room with a temperature in the range of 5-10 degrees Celsius. If there is no suitable place for her in the apartment, after flowering, the stems are cut, and the pot is placed under a bath. After winter, the flower is removed from the "prison", they begin to water and feed.

As for garden hydrangea, and after winter it may refuse to grow, or it will grow, but slowly, for the same reasons - the poor state of the root system. Therefore, in the fall, before the onset of frost, the flower is no longer watered, so that the roots are in dry ground. Roots mulch sawdust, dry leaves, needles, crushed pine bark. Spud plant should not be - so you can damage the root system, which is located high in hydrangea. In winter, the hydrangea roots can be additionally covered with snow.

And in this case it is necessary to check the condition of the hydrangea roots, it is possible that they froze over in winter and the plant died. But maybe part of the roots remained healthy. In this case, they are dug out, remove the damaged areas, treated with coal powder and planted into the ground again.

In order for the hydrangea to grow well after winter, in the spring, just like a houseplant, it is watered with a solution of nitrogenous fertilizers, and during the formation of flowers it is fed with phosphorus and potassium.

What can not be done is to feed hydrangea with ashes. Why? Because it alkalizes the soil, that the flower does not like at all. The best fertilizers for hydrangea are agents that acidify the soil - nitrophoska, ecofosc, azofosk, Kemira.

White rot

First, the roots get sick, because the fungus that provokes the disease is in the ground. As a result, they will not be able to deliver to the culture the useful macro- and microelements it needs, the water and the plant will turn brown and die. Since the roots are located in the ground, the disease is recognized by darkened shoots, as well as whitish patina, resembling cotton wool. Then blackish blotches - sclerotia are formed on the plaque.

White Hydrangea Disease

To destroy the fungus, it is necessary to spray the culture with fungicides: Fitosporin, Fundazol, Home. But do not forget that Fitosporin has a fourth hazard class (it is almost safe, it can cause a slight inflammation of the mucous membrane upon contact). Pour 20 g of Fitosporin powder into a bucket of water, inject hydrangea. And after 2 weeks, spraying is repeated.

But Fundazol is classified as a highly toxic substance (second hazard class). Pour 10 g of powder into a bucket of water. When spraying spend 1.5 liters of the composition per 10 m². To prepare the solution from the fungicide Xom pour 30-40 g of powder in a bucket of water, and then spray the bushes.

Gray rot

When it stalks and foliage becomes soft, watery. If it rains constantly, a grayish fluff is visible on the culture. If there is a heat and a drought, then the sick parts dry up and fall out. As a result, holes are visible on the plant.

Disease of gray hydrangea

Pour 8 ml of Pure Color into a bucket of water (10 L). When spraying spend 0.5 liters per 10 m². And after 2 weeks sprayed again. If the plant is planted in the garden, then process it Rovral Flo 255 SC. And then after 21 days, spray again with the same solution. After that, wait another 21 days and process the culture a third time.

The causative agent is the fungus Septoria. It can be understood that the culture began to hurt if you found brownish specks on the foliage (2-6 mm in diameter). They are beige in the center and dark brown around the edges. Then these spots crawl, becoming more and more, and then the hydrangea begins to shed foliage. If the disease has spread much, then the spots are visible on the shoots.

Hydrangea disease septoria

To cure, tear off all diseased leaves. Spray the culture with compounds that have copper, for example, Hom, copper sulfate, Ridomil Gold.

2.5 g of Ridomil Gold are poured into 200 ml of water, mixed, and another 800 ml of water is added, mixed again and sprayed on the plants.

Mealy dew

It is noticed by the appearance of blurry yellowish-green specks on the foliage. Subsequently, the spots become dark brown and clearer. From below foliage there is a grayish or violet raid. As a result, the culture drops foliage.

Powdery Mildew Hydrangea Disease

For treatment, plants are sprayed with Fitosporin, Alirin. If the disease has spread much, it is treated with Skor, Topaz, Chistotsvetom. To get rid of powdery mildew make the composition of 1 ampoule (2 ml) Topaz and a bucket of water (10 l).


The disease appears during heavy rains and warm weather. All foliage is covered with greasy stains, after they become dark. For treatment, spray the plant with a solution: pour 15 g of copper sulphate and 150 g of green soap into a bucket of pure water.

The disease is easily detected by dark orange spots. The reasons - too dense planting bushes, excess nitrogen in the soil.

Hydrangea rust disease

For treatment it is better to spray the culture with a solution - 40 g of copper oxychloride should be placed in a bucket of water (10 l). Still it is possible to process culture with Topaz, Ordan, Falcon. To prepare the Topaz solution, pour 2 ampoules (4 ml) into a bucket of water (10 l), and then treat the bushes.

The order is applied as follows: first, a bag of 25 g of powder is poured into 1 liter of water, meticulously mixed so that it is completely dissolved, then the composition is poured into the sprayer tank and poured in 9 l of the purest water, tightly closed and shaken intensively. After that, the mixture is ready.

For the treatment of rust, pour 10 ml of Falcon into a bucket of water (10 l), and for the prevention of the disease dissolve 5 ml of the composition in 10 l of water. Treated bushes.

Fusarium (tracheomycous wilt)

The fungus penetrates the plants through the contaminated soil; at first it infects the roots, which soften, turn brown, and rot. As a result, the plant ceases to receive nutrients, shoots fade, foliage turns yellow, buds fall.

For the treatment of collecting 2-2.5 kg of nettle and celandine, placed in 50 liters of water, leave for 24 hours. Then to 1 part of the infusion pour 5 parts of water and water the plants. You can spray bushes with a solution of Fundazole.

Phyllostikose spotting (phyllostiktosis, brown spotting)

It is detected by the appearance on the foliage of large brownish spots, which have a wide rim of crimson. Then these places fall out. The causative agent of the disease is the fungus Phyllosticta rosae.

For treatment, the bushes are sprayed with a solution of the drug Strobe, diluting 4 g in a bucket of water (10 l). You can also use Abiga-Peak, diluting 40-50 g in a bucket half filled with water (5 liters).

It is determined by the fact that the foliage of the culture becomes lighter, it turns yellow, and the streaks on the foliage do not change their shade. The disease appears due to the lack of iron in the soil. Even chlorosis can manifest itself by the way small leaves appear on the plant, the buds become deformed, the leaves curl, the stems dry.

Hydrangea chlorosis disease

For treatment, it is necessary to fertilize the culture with compounds that contain readily available iron. For example, antichlorosis. For treatment, you can make root dressing, dissolving 1 cap in 1 liter of pure water. Between dressing requires an interval of 15 days. You can also do top dressing by foliage by dissolving 1 cap in 1 liter of water, but you should not fertilize at the same time as the root and foliage. Instead, funds can also be used Ferovit.

You can also create a top dressing, sprinkle 2 g of iron sulphate and 4 g of citric acid in 1 liter of water. Then this composition is sprayed on the foliage, and if the disease is in a serious stage, then poured at the root. You can also make a solution: pour 40 g of potassium nitrate in 10 liters of pure water. It is necessary to water the culture, and after 3 days make the same composition and water again.

Ring spots

Hydrangea Disease Ring Spot

First, fuzzy ring-shaped spots appear on the plant (their diameter is about 2 cm). Then the foliage becomes deformed, shriveled, it falls. Also, the plant can stop blooming or small and weak buds appear. Unfortunately, not yet developed drugs that would treat ring spot. But you need to remember that the disease can be transmitted through seedlings. So get healthy, strong seedlings. And if you want to propagate the culture by cuttings, then cut off completely healthy cuttings.

When it appears on the stems brownish spots appear, and ulcers under them. The sores grow and the stems begin to die off. Causes of cancer: diseased seedlings, lack of fertilizers, thickening of plantings. If a disease appears, pluck out the diseased bushes and burn them.

Difficulties and problems in growing hydrangeas

Foliage can turn yellow for a variety of reasons:

  • direct sunlight falls on the flower. Since he likes penumbra, you should not plant him in the bright sun,
  • excess moisture in the ground. Although the flower likes watering, foliage may turn yellow because of stagnant water.
  • frequent drafts,
  • if the plant blooms very abundantly, and therefore uses a lot of nutrients and moisture, the foliage can also turn yellow,
  • lack of macro and microelements. The plant is required for the growth of constant feeding,
  • alkaline or neutral acidity of the soil. The plant loves the earth, which has acidic properties (pH 3-6). The color of the buds depends on the acidic characteristics of the soil: indigo and dark-violet flowers grow well in acidic soil, and white and pale pink in slightly acidic soil. To increase the amount of acid in the ground when watering requires 2-4 drops of lemon juice in 1 l of the purest water.

Also, foliage can dry out and fall off for a number of reasons:

  • lack of moisture in the heat,
  • too dry air. This happens if hydrangea grows in a pot in an apartment or planted in a greenhouse. Therefore, you should constantly air the room, open the vents. Spray the plant
  • lack of necessary plant elements. You can make nutrient solutions every 7-10 days. This is required for the formation of buds and blooming flowers. It happens that the foliage of the plant turns black.

Dry blackening is the appearance of brownish specks on the edges of the foliage. Then, after a while, the foliage fades. This can happen due to:

  • watering too hard water. It is advised to pour water, which was a day,
  • burns on foliage from the bright sun. Required pritenyat culture.

Wet blackening occurs due to:

  • sudden changes in air temperature
  • excessive moisture in the soil,
  • if the plant is planted in heavy clay soil, through which water and air do not pass well.

Leaf aphid

Aphid is a tiny insect that moves with the help of 3 pairs of long legs. It is dangerous in that it sucks the juice from the culture, and after it there is a sugary discharge. Soot fungus then develops on these secretions, and they also attract ants. As a result, culture grows slowly. If aphids are very numerous, then the foliage becomes yellow and deformed. If the aphids are small, then you can wash it off the plant by watering with a hose or washing the culture with soap and water. I also eat ladybugs. Therefore, if you plant close to the hydrangea of ​​the marigold, it will attract ladybirds.

Spider mite

These are the smallest pests ranging in size from 0.2 mm to 1 mm. They can be found on a small cobweb and yellowish spots on the foliage, which grow and merge. Ticks like heat and low air humidity, while they actively reproduce. As a result, the foliage dries. And the plant starts dropping foliage.

If there are not very many ticks, you can wash the plants with a solution with soap and water. If there are many parasites, then it is worth treating the plants with such means as: Fitoverm, Lightning, Akarin. When using the drug Lightning (the third class of danger to humans), 3-4 ml of the drug should first be diluted in 2 liters of water. Then pour another 8 liters of water.

Akarin is safe for humans and warm-blooded animals. For processing hydrangeas take sprayer with a fine spray. Since the tool does not penetrate the foliage, it is recommended to add soap for better adhesion. To kill ticks, it is enough to pour 3 ml in 1 l of water, and to eliminate aphids - 6 ml in 1 l of the purest water. Parasites begin to die 3 days after treatment, and the maximum number of pests dies after 6 days.

From spider mites and aphids, you can spray the bushes with the biological preparation Bicol, which is safe, that is, it can harm only the parasites. To create a working solution dissolve 60-160 g in a bucket of water (10 l).

Gallic nematode

These are tiny worms, they love the increased soil moisture. Their activity can be seen by the appearance of growths - galls on the stems, roots. These nematodes make their way through the roots to the stems and foliage, leaving poisonous secretions. When this plant stops growing, they may die.

Gardeners professionals advise to pull out and burn the plant, which was attacked by nematodes. True, you can still spray bushes Karbofos. But the remedy for direct sunlight quickly decays and loses its effect. It is advised to spray it with an agent in early spring, before the plants bloom, since it destroys the bees. Make the working solution by adding 75 g to a bucket of water (10 l). Spray the seedlings on a warm sunny day, when there is no wind, and the air temperature has reached +15 degrees Celsius.

If the planting is too thick, slugs can multiply in them. They actively eat foliage. Slugs can be assembled by hand. You can also scatter on the ground the granules of the drug Moluscid.

Disease prevention

It is necessary to choose the right place for planting a flower. The plant loves penumbra. It is necessary to plant a flower in light soil, which has acidic properties. Culture does not like heavy alkaline or neutral soils. If you decide to plant a flower in an apartment, you can make the land yourself by mixing 4 shares of sod, 2 shares of leafy land, 2 shares of peat and 1 share of coarse river sand.

Since gall nematodes die from high temperatures, in the spring before planting the soil can be shed with hot water (t = + 50-55 ° C) so that it passes to a depth of 15-20 cm. Then you can cover the soil with polyethylene so that the water more slowly cooled down. True, if the earth is severely affected by nematodes, then part of the parasites can descend below and escape.

Also, parasites are scared away by marigold and calendula plants, so you can sow them near hydrangeas.

It is necessary to fertilize plants in spring with nitrogen. To do this, pour 1 tbsp. spoon of potassium sulfate or urea in a bucket of water. Under a single plant poured 5 liters of solution. You can also feed a solution of 1 share of manure and 10 shares of water. Летом удобряют фосфором и калием (нитрофоской, Кемирой цветочной, нитроаммофоской, Агриколой). Всыпают 1 ст. ложку нитрофоски или Агриколы в ведро воды (10 л). А осенью пользуются только фосфором (подбавляют 1 ст.spoon of superphosphate in a bucket of pure water). Kemira flower do so: pour 10 g in a bucket of water (10 l).

Early in the spring, it is advised to spray the plant for prevention from diseases and parasite attacks with a solution, pour 100 g of copper sulfate into a bucket of water. Instead, culture can be treated with Fitosporin, Topaz, Spark.

If you grow your hydrangea, fully complying with agricultural techniques, watering properly, feeding, doing preventive spraying in early spring to prevent hydrangea diseases and pest attacks, she will thank you with lush and large flowers.

External stimuli

In addition to infection by pests and clearly expressed diseases, there are external factors that adversely affect the beauty and health of hydrangea. For example, yellowing of the leaves can be caused by such irritants:

  • The bright scorching sun. The plant prefers to be in the penumbra, so too much light can harm.
  • Waterlogging. Although hydrangea loves moisture, excessive accumulation of water can cause yellowing of foliage.
  • Lack of fertilizer. For growth and lush flowering hydrangea needs regular feeding.
  • Reduced soil acidity. The flower requires acidic soil (pH 3-6). Even the color of flowers depends on the level of acidity: the more acidic the soil, the more violet and blue colors appear, closer to neutral - white and pink shades prevail. To increase the acidity, periodically during the irrigation should be 2 liters of lemon juice added to 1 liter of water.

Sometimes the foliage of hydrangea begins to dry and fall. The reason also lies in external stimuli:

  • Insufficient watering, especially during hot seasons.
  • Low environmental humidity. This often happens in enclosed spaces, greenhouses. It is important to regularly air and humidify the air.
  • Lack of nutrients. Top dressing hydrangeas are held 1 time in 7-10 days. This is especially important during the formation of buds and flowering.

Sometimes florist may face blackening of hydrangea leaves. It is dry or wet and is also caused by external factors.

Dry blackening manifests itself in the formation of brown spots on the edges of the leaves, which subsequently lead to wilting of the foliage. The reason may be:

  • Hard water. Before irrigation, it is recommended to defend the water, at least for a day,
  • Sunburn. It is important to protect the plant from direct sunlight.

Wet blackening determined by limp darkened leaves. It may appear due to:

  • Sudden temperature drops, drafts,
  • Excessive watering,
  • Heavy soil that retains moisture and inhibits breathing.

Hydrangea chlorosis

Chlorosis occurs due to the lack of iron in the soil or as a result of metabolic disorders in the plant itself, which is why it cannot absorb iron.

The main symptom of chlorosis is lightening and yellowing of foliage.. In this case, the veins on the leaves remain dark.

In addition, there may be a decrease in the size of the leaves, the deformation of the buds, the twisting of the leaf plates, the drying of the shoots.

When a disease is detected, it is important to feed the plant with preparations containing chelated iron, for example, Anti-Chlorosis and Ferovite.

Also, the therapeutic composition can be prepared independently. To do this, dissolve 2 grams of ferrous sulfate and 4 grams of citric acid in a liter of water. This solution should be sprayed on the leaves of the hydrangea, and with the running form of the disease - and watered at the root.

Another method of treating hydrangea chlorosis is using a solution of potassium nitrate and iron sulphate. For this, 40 grams of potassium nitrate is diluted in a bucket of water. Hydrangea is watered with this solution 2-3 times. After 3 days should be irrigated with sulphate of iron in the same concentration.

Fungal hydrangea diseases

White rot starts with a root system lesion, because the pathogen fungus is in the soil. As a result, the plant can not receive the necessary nutrients, turns brown and eventually dies.

A sign of the disease on young hydrangeas is the darkening of the shoots and the appearance of white bloom, similar to cotton wool. If you do not treat the flower, black blotches - sclerotia - appear on the cotton wool.

For the fight against white rot, fungicides such as Fitosporin, Fundazol, Copper Oxide are effective.

Gray rot manifested in the softness and wateriness of the tissues of hydrangea. In a humid environment, a gray “down” appears on the plant. In dry weather, the affected parts dry out and die off, leaving behind holes in the leaves and stems.

The first point of the fight against gray mold is the removal of the affected and dead parts. In the treatment of indoor hydrangea species, Chistotsvet, Fundazol, Shk. In case of garden hydrangea disease, it is recommended to process Rovral Flo 255 SC three times with an interval of 3 weeks.

Septoria can be identified by dark brown spots on the leaves, 2-6 mm in diameter. Leaves gradually die and fall off.

Without treatment, hydrangea can lose all foliage and die. With the running form of the disease, spots appear on the shoots.

To get rid of septoria, all the affected parts are removed, and the plant itself is treated with preparations containing copper, for example, copper oxychloride, copper sulphate.

Mealy dew determined by the yellow-green spots on the leaves, which eventually turn brown and take a clear form.

On the back of the leaves you can see purple or gray bloom. Without treatment, the leaves fall off, and the young shoots affected by the fungus are deformed and do not survive the winter.

For the treatment of powdery mildew, fungicides are used: Fitosporin, Alirin. At the advanced stages - Skor, Topaz, Tiovit Jet, Chistotsvet.

Diseases of hydrangea garden, caused by metabolic disorders

Culture is quite demanding in the care. There are certain factors to which hydrangea reacts very acutely, and leaf diseases are most often provoked:

  • a bright hot sun
  • excess moisture
  • nutritional deficiencies
  • change in soil acidity.

Falling hydrangea leaves

If the leaves began to turn yellow and crumble - this indicates a lack of watering in hot weather, and a lack of minerals. It is necessary to increase the amount of moisture, and feed the plant. Regular feeding should be done every 10 days.

Affected Hydrangea - Leaf Disease

Dry blackening of leaves

On the edges of the leaf plates may appear brown dry spots that gradually cover the entire foliage. Causes: hard water and sunburn. It is necessary to shade the plants, and water - to defend.

Diseases of hydrangea garden - dry blackening of leaves

Wet blackening of leaves

The leaves become soft and shapeless, becoming dark in color. This can occur due to heavy soils, a sharp jump in temperature, or excessive irrigation. Should eliminate the irritant, or transplant the plant.

Wet blackening of hydrangea leaves

Viral ring spots of hydrangea (Latin Mycosphaerella brassicicola)

In addition to the fungal diseases that may affect hydrangea, diseases of viral origin also require detailed study.

Viral diseases of tree hydrangea, photo ring spots

Ring spots are necrotic in nature. The leaves frown, and the plant will certainly perish. Drug treatment disease does not exist. Affected bushes must be removed and burned. The cause of a virus outbreak can be:

  • poor quality planting material
  • insects that carry fungi and viruses,
  • unprocessed garden tools.

Insects that carry large-leaved hydrangea diseases, photo

Diseases of large-leaved hydrangea, like of other species, are often transferred to healthy plants by pests. Among such insects:

  • gall nematodes,
  • spider mites,
  • aphid.
Garden hydrangea, diseases and pests - photo spider mite

It is recommended to use insecticides against pests: Akarin, Commander, Tanrek.

Prophylactic agents to protect the hydrangea

Since diseases develop under certain weather conditions, when grown in an unstable climate in the Moscow region, the risk of infection is quite high. Therefore, preventive plant protection measures are essential:

  • in autumn and early spring, bushes are treated with Bordeaux mixture,
  • planting material is subject to processing of blue vitriol,
  • before planting insecticides are applied to the soil,
  • the site must be cleaned regularly, and plant residues destroyed.
Timely prevention will help protect hydrangea from diseases and pests.

Compliance with the rules of agricultural technology - the guarantee of health of the entire garden. Moderate watering, the right choice of soil, and regular fertilizing are mandatory measures when growing hydrangea.

If you adhere to growing conditions and adhere to preventive measures on your site, beautiful garden hydrangea will bloom, diseases and pests, which we have selected photos, are not so terrible if you take the necessary measures in time, start treatment and stop the spread.

The reasons why hydrangea grows poorly

Growth is influenced by many factors. The root system is an indicator of intensive growth and flowering, so its condition and adverse conditions affect the appearance of the shrub.

There can be several reasons:

  • the plant has poorly winterized,
  • damaged kidneys during the spring frosts,
  • climatic conditions are not suitable for the variety
  • the level of soil acidity is reduced,
  • drying up the ground
  • lack of oxygen
  • fertilizer shortage
  • diseases,
  • wrong pruning,
  • root damage.

To find out why the hydrangea grows poorly, it is better in the spring, in the active phase of growth.

Restore root system

First of all, it is necessary to determine the state of the roots. The root system may be damaged:

  • frost
  • pests
  • infectious and fungal diseases.

If the flower is in a pot, it is worth checking the condition by pulling out the plant along with a clod of earth. If the lesions are minor, the damaged areas are removed, the root system is rinsed with running water and disinfected with a solution of potassium permanganate or any special compound. The soil mixture is completely changed, feeding is carried out.

What to do if hydrangea does not grow in the open field? Be sure to check the status of the root system. To do this, carefully remove the top ground layer and check the roots for damage. If there are no visible changes, the nutrient soil mixture is filled up, fertilizers are added. If necessary, the bush gently dug with a clod of earth and transplanted to another location.


Hydrangea is not growing, the disease is affected. This can be determined by external signs.

  1. Chlorosis - a common disease among all varieties of horticultural crops. The leaves change shade to lighter, while the streaks remain dark green. The leaves become smaller, the buds are formed small, deformed and fall. Plants can not absorb nutrients due to impaired metabolism. The problem usually arises if the flower grows in one place for many years. For the treatment and prevention of used "Antihloroz", "Ferovit", "Agricola". Effectively use the compositions prepared by himself: a solution of 1 liter of water, 4 g of citric acid and 2 g of ferrous sulfate. For large seating areas such composition is prepared: 10 liters of water and 40 g of potassium nitrate.
  2. Gray rot characterized by tissue damage. They become watery. Fungal disease appears in the period of prolonged rains. It is necessary to remove damaged areas, take them out of the area and burn them. To process "Fundazol".
  3. Perinosporosis occurs when the air temperature is high and the air is humid. Fatty spots on foliage darken with time. The treatment is carried out with a composition of 10 l of water, 15-20 g of copper sulphate and 150 g of liquid soap (or with a solution from household soap).
  4. Mealy dew It appears as yellow and green spots, gray patina on the inside of the leaf. Young shoots, deformed, die. The shrub slowly fades. To combat the disease effectively apply fungicides: "Topaz", "Fitosporin-B", "Skor".
  5. Septoria visible on brown spots on foliage. Plants are treated with blue vitriol.
  6. Ring spots - A viral disease that affects the shrub in a short time. Necrotic processes cannot be stopped. The shrub is removed with a clod of earth and destroyed.

It is necessary to periodically carefully examine the plantations to determine the reason why the hydrangea does not grow. Diseases in the early stages are easily eliminated.

Pests are often threatened, among the most common:

  • aphid,
  • spider mite,
  • slugs and snails,
  • gall nematodes.

If the first signs appear: wilting, yellowing and falling off of foliage, deformation of sprouts, flowers and inflorescences, drying out, it is necessary to take urgent measures. Spray is carried out with the help of personally prepared solutions:

  • 10 l of water, 20 g of anabasine sulfate, 7 g of thiophos,
  • 10 l of water, 200-250 g of chopped garlic, 50 g of liquid soap (insist two days).

One of the reasons why hydrangea grows slowly is the lack of nutrients. Mineral and organic fertilizers help flowering crops to grow, develop and bloom. Among the complex compositions should be allocated the most effective: “Fertika”, “Pokon”, “GreenWorld”. Their use simplifies maintenance, just follow the instructions on the package.

At home, you can prepare your own compositions for dressing based on 10 liters of water:

  • 50-60 g of ammonium sulfate, 15-20 g of potassium sulfate,
  • 20-25 g of superphosphate,
  • 40-50 g of potassium sulfate, 50-60 g of superphosphate.

It is necessary to alternately alternate mineral dressings with organic ones: mullein, infusion of green mass, liquid Biohumus.

It is important not to overdo the fertilization. Excessive feeding can provoke disease and inhibition of plants.

Preventive action to accelerate the growth of hydrangeas

If garden culture grows slowly, you need to check the quality of the soil. Dry and too dense ground is one of the reasons for the lack of growth. Abundant watering and loosening normalizes the situation in a short time. As a preventive measure, they are treated with Bordeaux liquid in the spring. To prevent the defeat of diseases and pests using traditional methods or chemicals.

Poorly grow young seedlings after improper pruning. It is also necessary to take into account the particular varieties. So, for example, new flower buds are laid at the ends of last year's shoots in shrubs of the first group: large-leaved hydrangeas, serrata, prickly and oak-leaved. The manipulation is carried out carefully, as the radical pruning will suspend the growth process and transfer the flowering period to the next year.

Bad weather conditions also adversely affect the intensity of development, the height of the shrub. When selecting a variety, it is necessary to take into account the climatic features of the variety.

As they grow up, the culture may stop developing with insufficient light or drafts, excessive gas pollution. It is necessary to determine the place in the garden with a slight shade. Be sure to check the condition of the branches, remove damaged and dry.

At observance of the recommended rules for the care, a flowering garden culture will actively grow each year. Flowering will be annual and abundant, the plant will delight the decorative appearance for many years.

How to cure chlorosis

Garden hydrangea can be affected by many diseases, and chlorosis is one of the most ferocious. Because of this disease, the leaves of the plant become pale or turn yellow, while the veins on them darken greatly. If you do not pay attention to these symptoms in time, the plant will lose its beauty over time, since all these signs are evidence of malnutrition, in particular iron deficiency.

Therefore, wherever you plant your hydrangea, regularly feed it with special fertilizers containing iron elements. Water the flower should be soft water collected during the rain. Also, do not plant garden hydrangea in a soil enriched with lime, and try to use humus as a minimum to feed it.

But if the disease has already manifested itself, it is recommended to spray hydrangea bushes with one of the following preparations:

  • Agricol,
  • Iron Chelate,
  • Antichlorosis,
  • Ferovit,
  • Ferrylene,
  • Micro Fe,
  • Brexil.
In addition to spraying, these drugs can also be applied at the root of the plant, but only in very small doses. Also, a solution made of 40 g of potassium nitrate and the same amount of ferrous sulfate diluted in 10-15 liters of water is used against hydrangea chlorosis. This solution can be used to water the flowers in the flowerpots and in the flowerbed: 2-3 times we feed with saltpeter, then with iron sulfate until the traces of the disease disappear.

Flower cancer: how to treat a disease

This disease began to occur in the beds of hydrangea fans not so long ago, as the European flower crab arrived at our summer cottages along with imported varieties. Despite this, the cancer is quite dangerous for the hydrangea and is manifested by brown spots, under which ulcers form on the stems.The longer you do not pay attention to this disease, the more it will progress - the sores will deepen, the stems will begin to die first in places, and then completely. The result is one - hydrangea can completely dry out.

There can be a lot of reasons for the defeat of bushes with cancer: infected planting material, poor feeding, due to areas damaged by hail, when the bushes are too thick. To cope with cancer, it is necessary to apply a whole range of measures:

  1. At the first signs of illness, try to remove all the affected areas on the flower and burn them.
  2. If the cancer appeared on the roots - the bush must be completely removed and burned.
  3. Provide flowers with all the necessary mineral and organic elements, which will increase the resistance of hydrangeas to various diseases.

Leaf Deformation: How to Cure Ring Spills

Ring spots, which lead to deformation of the leaves of a plant, are the most common viral disease of this flower. The disease develops gradually: at first, small lesions in the form of spots with fuzzy contours of the ring appear on the leaves of the hydrangea, then they dry them and force them to deform, making them asymmetric.

When the ring spot strongly affects the flower, it may not even bloom, or the flowering will be very weak. Unfortunately, it is impossible to get rid of this disease. The only measure that will help you prevent it is to carefully select seedlings for your flower bed.

Stem Nematode

Among the diseases of room hydrangea, as well as her garden relative, there is also a stem nematode. The nematode is a very small worms, which are particularly intensively developed in a humid environment, affecting not only the stems, but also the roots of the plant, as well as their leaves. Under the influence of nematodes, the normal development of the plant stops, and over time it may die.

Since nematode larvae are very small, it is not difficult for them to wade through the roots to the stalks and flower buds, which they severely damage. This parasite is also capable of leaving behind poisonous substances that stop the growth of hydrangea shoots and cause unsightly bloating on its stems.

If your hydrangea is also struck by stem nematodes, it is recommended to destroy the plant, since it is almost impossible to cope with them, but they can quickly move to other plants, including cultivated ones. The fact is that nematodes can spread with the soil, through pots, and even with water droplets that drain from the plant after watering, and by using inventory during processing.

White sclerocial rot

This is a fungal disease that is often found on hydrangeas. It is very difficult to cope with it, since its pathogens - sclerotia - are able to preserve their vital activity in plant residues forgotten on the ground after harvesting.

This type of rot first acts on the root system of the hydrangea, leading to its rotting and stopping the supply of nutrients to the stems of the flower, which eventually turns brown and dries out completely. At the same time, if the disease has struck young stems, they will not just begin to wither and grow brown, but they will also begin to progress to rot, over which a cotton-like patina of white color is formed. It is impossible to allow the formation of this plaque, as sclerotia will form under it, which can completely infect your entire flower garden.

Thus, it is better to immediately remove the hydrangea affected by white sclerocial rot from the flower bed, thereby stopping the development of the disease.