Today we’re going to talk about probably the most common problem associated with growing hydrangeas, and that is changing the color of the leaves. Leaves are a good indicator of plant health and if you know how to recognize a problem based on how the leaf looks, you can solve it.
Underwatering, sunburn, overfeeding, or disease are the main causes of hydrangea leaves turning brown. To fix brown leaves, water hydrangea when the 2 inches of soil are dry and provide the plant with dappled sun. Also, avoid fertilizing hydrangea more than 2 to 3 times a year. Keep the garden free of plant debris and make sure there is good air circulation around the hydrangea to avoid the leaves turning brown.
|Underwatering||The leaves will brown and become crispy. Leaves are wilting.||The soil near the hydrangea should not be dried deeper than 2 inches.|
|Sunburn||Leaves will turn brown starting at the edges and tips, or get burnt in the middle of the leaf blade.
Burnt hydrangea flowers.
Leaves drying out.
|Shade or move the hydrangea to partial shade and water it well.|
|Overfertilization||Leaves get edge burn and large brownish spots appear.||Flush the fertilizer out of the soil with plenty of water. Do not fertilize more than twice a year.|
|Pests||The leaves will turn pale and brown and then curl.||Spray the hydrangea with horticultural oil. Keep the garden clean.|
|Fungal diseases||Brown spots appear on the leaves.||Spray the hydrangea with fungicide, clear the garden of decaying vegetation, and water in moderation.|
|Transplant shock||The leaves will turn brown starting at the tips.||Shade the hydrangea and keep the soil slightly moist or don’t let it dry out more than 1 inch.|
|Heat stress||The leaves are yellowing, curling, and browning at the tips.||Remove the badly damaged leaves and shade the hydrangea for the duration of the severe heat. Water it once more.|
|Overwatering||Leaves turn yellow or brown starting at the tips and along the edge.||Water the hydrangea when the soil is 2 inches dry. Use pots with drainage holes.|
|Frost||The leaves will turn black or reddish-brown.||Cover the hydrangea for the duration of the frost.|
Everyone needs water, and hydrangeas are no exception. Moreover, these plants are very water-loving and a brief drought will leave a mark on the leaves. If the weather has not been too sunny, the leaves may just wilt, but if the sun has been strong, it will quickly dry out the leaves and they will turn brown.
You will get the same result if there is a dry and hot wind. The plant will not be able to supply the leaves with water and they will suffer.
Most of the time this happens in the heat of the summer. But sometimes it can also happen in spring if the hydrangea is growing in a pot. In windy and warm weather the substrate in the container tends to dry out very quickly.
- Proper watering can solve this problem. Check how wet the substrate is with your fingers or a moisture meter. If the soil is more than 2 inches dry around the roots, the plant needs watering. For potted hydrangeas, I recommend watering when the soil is 1 inch dry.
- It is best to water in the evening or morning as watering in the heat can be detrimental. Also, try not to water over the leaves, but directly on the ground. The amount of water should be considerable, 1 to 3 gallons depending on the size of the hydrangea.
Damaged leaves are likely to fall off but the plant will stay alive. If you follow my watering recommendations, the hydrangea will recover soon. But it may not bloom this year.
Excessive sun very often makes hydrangeas suffer. This is especially true of Mophead hydrangeas, as they are much more sensitive to sunlight. If you grow them in full sun, they can easily get burnt in the summertime and their leaves will turn a dark brown color.
The brown spots can appear in the middle of the leaf or the leaf can get crispy from the edge. Flowers can also sometimes burn and turn brown as well.
Hydrangeas planted in pots suffer the most from the strong sun. This is because the pot dries out very quickly in the sun and the leaves can burn in a matter of hours and even turn black.
Hydrangea paniculata can withstand almost a full day of direct sunlight. So if you don’t have a shady spot, choose this plant. All other hydrangea species need partial shade.
- Provide your hydrangea with up to 6 hours of direct sun a day, and shade the rest of the day.
- If your hydrangea is burnt, water it with plenty of water and shade it.
- Next spring, move it to a location with less sunlight.
- If your hydrangea is growing in a pot then move it to partial shade immediately.
The next thing you need to be aware of is over-fertilizing hydrangeas. Very often in the pursuit of large inflorescences, many gardeners apply too much of various fertilizers. The first thing that will happen is that the plant will grow heavily and become weak.
But if the concentration of nutrients is very high, the leaves will burn off from the edges. This burn is a bit like a sunburn – a dry light brown edge. On top of that, the leaves will get big brownish-maroon spots.
- Water the hydrangea generously, whether it is in a pot or the ground. This will flush out the salts that have accumulated in the soil through over-fertilization. Do this again no sooner than the top layer of soil dries out a little.
- Fertilize hydrangeas no more than twice a season. But do this with a slow-release fertilizer designed specifically for hydrangeas. This way, you will avoid over-fertilization because the trace elements will gradually get into the soil.
- The first application should be made in early spring before the buds open. The second time is in summer after flowering, so that the hydrangea has enough energy to overwinter and flower abundantly the next year.
- Avoid fertilizing in late autumn and winter.
Insects are a very serious threat to most plants. There are almost no ornamental plants that are not affected by pests in one way or another. Hydrangea is no exception in this sense, many insects use it as a source of food.
Hydrangea leaves turn brown, with no visible signs of damage, through sucking insects. This is especially true of aphids, mealybugs, scale, and a few others. They all form colonies under the leaves and feed on the sap of the plant. As a result, the leaves turn brown and curl.
I want to say separately about mites. They are very small creatures that are only visible under a magnifying glass, but a large colony of them can cause considerable damage to hydrangeas.
- Spray hydrangea with horticultural oil. Prepare an aqueous solution of horticultural oil according to the instructions, then apply it to the leaves.
- Repeat the treatment after a few days. This will usually be enough for the hydrangea to recover after a while.
- Spray the plant with acaricide to get rid of the mites. In most cases, you will need two or three treatments.
Diseases, along with pests, are a great danger to hydrangeas and other plants. Different diseases will have different effects on the plant, but a number of them will cause the leaves to turn brown.
The two most common diseases are Anthracnose and Cercospora leaf spot. The symptoms of Anthracnose are small light brown spots on the leaves, which become larger over time, and the leaves turn yellow and fall off.
Cercospora also shows up as leaf spots, but they are darker and larger. After a while, part of the leaf may turn brown.
- Spray hydrangeas with a fungicide to cure them of the disease. Use fungicides containing Thiophanate-methyl or copper.
- Keep the area around hydrangeas clear of decaying vegetation.
- Allow plenty of space between the shrubs for ventilation.
- Avoid overwatering and underwatering hydrangeas.
Plants grown in nurseries tend to take root poorly in gardens. This is because nurseries use a very light substrate and daily watering. In addition, their plants usually grow under a shading net.
By planting such hydrangea in heavy soil in the blazing sun, you run the risk of losing it. Or at least after planting, the leaves will turn brown or droop. This is called transplant shock.
This can also happen if you transplant hydrangeas from one place in the garden to another. No matter how carefully you do this, some of the roots will be damaged and the hydrangea will react with a change in foliage color.
- Provide the hydrangea with as much shade as possible.
- Water it when the soil is 1 inch dry but no more.
- When moving hydrangeas in the garden, try to damage as few roots as possible.
- To improve soil quality, add 1-2 buckets of organic matter such as compost.
Too much heat can also be bad for hydrangea’s health. Like most plants, hydrangeas prefer a temperature of 70-80°F. But if the temperature rises above 90°F on a summer day, the hydrangea can get temperature stress.
Overheating usually occurs with hydrangeas growing in pots. But it can also sometimes happen to plants that are grown in the ground.
Symptoms will be drooping and curling leaves with a crisp, light brown edge.
- Move the potted hydrangea to a shady and cool place. If the hydrangea is growing in the ground mount a garden umbrella over it (or something similar) for times of extreme heat.
- Water it with a generous amount of water.
- Next spring, transplant the hydrangea to a cooler, less sunny location.
Overwatering is a real disaster for most plants, no matter what the cause. Hydrangea is considered a water-loving plant, but it is still not a mangrove. It can tolerate slightly damp soil for a while, but if the roots are constantly in the swamp, they will begin to rot.
As a result of root rot, all internal processes in the hydrangea are disturbed. Water will not flow to the leaves and they will turn yellow and wilt. But if the sun was shining hard they will turn brown at the tips and along the edge.
- Reduce the frequency of watering. Water hydrangeas only when the soil in the root zone is 2 inches dry.
- If the hydrangea is growing in a pot, make sure it has drainage holes.
- Provide shade to protect the plant from the scorching afternoon sun.
- Remove any damaged leaves.
- Next spring, transplant the hydrangea to a less wet location. Add several buckets of organic matter to the planting hole.
A drop in temperature, as well as extreme heat, can stress hydrangeas. Hydrangeas are generally regarded as frost-resistant, but only if they are dormant. If the leaves have already unfolded, late frost will damage them.
Not often, but sometimes it happens that in late spring or even in early summer there may be a frost. In this case, the young leaves will turn black and wither. The lower, more mature leaves will partially turn brown or reddish-brown.
- Remove the dead leaves.
- Water it with liquid fertilizer, but the concentration should be half of what is recommended.
- Cover the hydrangea if the weather forecast suggests frost. There are many cover materials available for this purpose.
- Move the hydrangea indoors if it is growing in a pot for the duration of the freeze.
- Both thirst and root rot from overwatering can turn hydrangea leaves brown. Water the hydrangea no sooner or later than the soil is 2 inches dry.
- Too much sun and extreme heat will cause the leaves to burn (brown). Shade the hydrangea or transplant it into the half-shade.
- Over-fertilization can cause leaf scorch. Fertilize the hydrangea no more than twice a season with a slow-release fertilizer.
- Diseases and pests can damage the leaves and they will turn brown. Spray your hydrangea with horticultural oil or fungicide.
- Spring frosts can damage the leaves and they will turn black or brown. Cover the hydrangea for the cold weather.
People also ask
Should I cut off brown hydrangea leaves?
You should cut off the brown hydrangea leaves. Cut them off along the petiole to avoid damaging the stem. Throw the brown leaves in the trash.
What do you do when hydrangea leaves turn brown?
- I water hydrangeas in dry, hot weather with at least 1 gallon of water.
- Spray hydrangea leaves with a multi-purpose fungicide.
- Reducing the number of sunlight hours for hydrangeas.
- Reduce the frequency of watering and only water if the soil is 2-3 dimes dry.
- Get rid of pests on hydrangea leaves.
- Protect hydrangeas from late frosts.
What does overwatered hydrangea look like?
An overwatered hydrangea looks like yellowed leaves. They then turn brown and fall off.
Why are my hydrangea leaves turning brown and curling?
Underwatering is the cause of hydrangea leaves turning brown and curling. The lack of water causes the leaves to curl and turn brown when exposed to the sun.
To fix this you need to immediately water the hydrangea with 1-2 gallons of water.
Why are my hydrangea leaves turning brown and crispy?
Hydrangea leaves turn brown and crispy because of sunburn. To fix this, provide the hydrangea with shade.
Why are my hydrangea leaves turning yellow and brown?
Yellowing and browning of hydrangea leaves is caused by overwatering. To fix this, water the hydrangea only after the soil has dried 2 inches in the root zone.