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A tonic for black spot and powdery mildew on roses Roses, while beautiful, are often plagued with black spot or powdery mildew. I mix these ingredients into a tonic, which I spray on my roses: 2 teaspoons of baking soda and 1/2 teaspoon of liquid soap or Murphy's oil soap in 2 quarts of water. The tonic protects the roses for months.
To protect plants in the cabbage family from having their leaves eaten: Mix 2 tablespoons of red-pepper powder and 6 drops of liquid soap in 1 gallon of water. Let the mixture sit overnight, and stir thoroughly. Pour the mixture into a spray bottle, shake well, and spray weekly on the tops and bottoms of the leaves.
"Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases."
2. For large areas, spray the vegetation, lay down pieces of cardboard, top them with shredded bark (a layer at least 3 inches deep), and let the bed “rest” for a season. The next spring, the cardboard will be like mulch, and the bed will be weed-free and easy to work.