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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.
Understanding common tomato ailments.
15 Vegetables you can Grow in Autumn - in the garden or containers. Keep yourself in fresh veggies for salads, stir-fries, soups, and savory dishes right through to the first frost!