Close-up of powdery mildew on a green leaf

How to get rid of powdery mildew on your plants

Powdery mildew is a common problem for gardeners. This white, powdery substance can form on the leaves and stem of your plants, causing them to become weakened and stunted.

If left untreated, powdery mildew can kill your plants. But don’t worry. There are a few simple things you can do to get rid of this pesky problem.


The first step is to identify the affected plants. Powdery mildew usually forms on the upper side of leaves in humid conditions. If you see any affected leaves, remove them from the plant and dispose of them. This will help stop the spread of the disease.

A zucchini leaf with white spots. Clearly affected by the fungal plant disease powdery mildew.
Zucchini leaf affected by powdery mildew


Next, water your plants early in the day so that the leaves have time to dry before nightfall. Nighttime is when powdery mildew spores are most active. By keeping the leaves dry, you’ll make it harder for the spores to take hold.

Hand spraying water from a bottle on a zucchini leaf affected by powdery mildew.
Watering leaf affected by powdery mildew


Finally, make a mixture of 1 part milk to 9 parts water and spray it on all of your affected plants. The milk will help create an inhospitable environment for the powdery mildew spores, preventing them from taking hold. Repeat this treatment once a week until the problem is gone.


Powdery mildew can be a real pain for gardeners, but there’s no need to despair. With a little bit of effort, you can get rid of this problem for good.

Remember to remove affected leaves, water early in the day, and spray with milk weekly until the issue is resolved.