Did you know that you can get rid of black spot on your rose bush leave with onion skins? This tried and true tip is from Wendyl’s book Recipes For A Cleaner Life
An old-fashioned remedy is to save brown onion skins then place them around the base of the rose bushes with a little compost on top.
Within a month the black spot will have disappeared.
Several customers have tried this method and were impressed with the results. Hope it works for you too.