Black spot on rose leaves - help how do I rid?
I have several patio roses that were bombarded with black spot last year and I really could do with some advice on how to rid them of this fungus. It got so bad last year that the plants ended up dropping their leaves, before growing back new ones. I have been picking off any leaves with the issue and collecting ones that have dropped and disposing of these in the dustbin. It's really important that I help these roses as they are part of a memorial garden and the ashes to my beloved pets are scattered in the compost. Any advice would be appreciated. Many thanks.