Growing roses without chemical sprays or inorganic fertilzers requires knowledge of the different rose varieties as some are more vigorous and disease resistant than others.To grow roses organically you must first concentrate on the root system. The goal is to produce a vigorous, healthy plant that will outgrow disease. A large hole filled with compost or aged manure ( or a bag of steer manure ) plus a cup of bone meal is a good start. A six inch mulch keeps the roots cool and damp. Research has shown that three teaspoons of baking soda per gallon of water is a good deterrent for mildew. To keep blackspot at bay the best method is to select roses that are disease resistant. Many of the old roses are suitable for oragnic growing.
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