Stephen from Winter Garden, Fl writes
50% shade, covered by irrigation, under Oak trees with western sun exposure.
Bayer Advanced All In One Rose and Flower Care Granules are a very good option for black spot for roses. You will use 1 capful per plant. You will apply the granules to the base of the plant, work the granules into the soil and water thoroughly. You will reapply every 6 weeks and do no more than 3 applications per year. Make sure the roses and harborages are kept clean.
Answer last updated on: 05/20/2018