- Written by Robbi Hoy
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Helpful tip from The Garden Geeks with a black spot recipe: Did you know that you can cure black spot on roses by mixing 2 tablespoons of baking soda and 4 drops of Ivory Dish washing Liquid in a gallon of water. Spray this solution over the entire rose bush and repeat every 5 days until the spots disappear! So why do we buy all of those nasty chemicals??