Cotswolds Garden - FAQs
Frequently asked gardening related questions
Yes, a baking soda spray can be an effective organic remedy for powdery mildew on roses. Mix 1 teaspoon of baking soda (sodium bicarbonate) with 1 litre of water and a few drops of mild liquid soap (as a spreader/sticker). Spray thoroughly onto affected leaves, ensuring good coverage of both upper and lower surfaces. Apply in early morning or late evening. Repeat every 5-7 days or after rain. Baking soda alters the pH on the leaf surface, making it inhospitable for fungal growth, but doesn't cure existing damage.
Permalink: Can I use baking soda spray for powdery mildew on roses?