Where you live makes a difference when it comes to rose problems. A variety that is disease resistant in one location may be disease prone in another, so choose accordingly.

Make your own powdery mildew spray by combining 3 teaspoons baking soda with 2 tablespoons highly refined summer oil and 1 gallon of water. Spray every 10 days to two weeks.

Photography by Suzanne DeJohn/National Gardening Association