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There is nothing more frustrating then to work incredibly hard cultivating new plants, caring to their every need day in and day out only to see your hydrangea leaves wilting and turning brown.
Problem: If you have recently transplanted your hydrangeas they might not take to their new location effectively. Some plants taken from a nursery come in a potting soil mixture that is very high in peat moss. This is a cheap filler that nurseries rely on and it dries out very quickly. So if you recently transplanted your hydrangea it could simply be Browning as a result of insufficient moisture through lack of watering.
When you get plants from a nursery you always want to check the roots. If you see the roots are compact, woven together, soak the root ball in water and then carefully loosen the roots with your hand before you plant them. You can incredibly carefully try to recreate this loosening movement around the root ball if you just planted your hydrangeas.
Solution: Overall you want to keep the soil uniformly moist thereafter. Remember that hydrangeas prefer moist soil so you should water them regularly.
Problem: In some cases, if the leaves of your hydrangea shrub are wilting and turning brown it could be indicative of burned leaves the result of excess fertilizer or pesticides. While fertilizer and pesticides alike serve important purposes, too much of a good thing can cause toxicity symptoms in your hydrangeas. These symptoms can include browning leaves, burnt leaves, increased susceptibility to pests or infection.
Check how much you are using if you are using fertilizer. It is recommended that you apply no more than two cups of a balanced fertilizer for every 100 square feet so those with very small hydrangea shrub potted throughout their garden might very well be using too much.
There is a risk of toxicity during the summer months when the sun is at its highest.
Solution: To rectify this you can water your plants after you have fertilized them to disperse the chemicals throughout the soil and read the application rates of feeds carefully.
Problem: There are many species of fungus that go after hydrangea leaves, resulting in that brown spots you might see on your shrubs.
Solution: The solution to this is multifold. First, you want to take preventative measures by keeping water off of your hydrangea leaves whenever you water your shrubs. Try to water at the base if at all possible.
The time of day you choose to water is important. Watering under the direct afternoon sun will promote better blooms but too much sunlight coupled with excessively wet leaves from irrigation leads to fungal spots. Most hydrangeas like dappled shade.
If you notice that any leaves have been damaged or disease, prune them off immediately and get rid of them. Remove plant debris and dropped flowers from under your hydrangeas. Fungus thrives in moist, darker areas so don’t create an environment they will love.
Tangentially before you go out to prune anything, disinfect your pruners using a household disinfectant or a mixture of 9 parts water to 1 part bleach, then rinse in a solution of household dish soap and water. If you prune just one infected branch or leaf from another part of your garden and forget to disinfect, you can transport that fungus from one plant to another. Take measures to avoid spreading disease.
If you are able to, give your shrubs at least six feet of space between one another. This allows for better air circulation. Poor air circulation is conducive to the development of fungus just the same way as excess moisture and darkness.
Problem: On a rare occasion, you might have a problem with pests like aphids or scale insects. These will result in your leaves shrivelling up and turning brown.
Solution: The solution is to use a direct stream of water to physically wash the pests off the leaves. But aphids are a tricky bunch. You have to make sure you remove each of them because if there are any survivors they will continue to propagate and damage your hydrangeas.
Be careful with the power of the water stream used; you don’t want to damage the leaves themselves in the process. Also, try to avoid insecticides because these kill off other insects that are necessary and at times can scorch your leaves. A good natural mixture to use is diluted dish soap which coats the aphids and other insects with the soap solution, suffocating them gently.
If you really need to, you can turn to pesticides but we recommend trying other methods first if at all possible.