Black spots on rose leaves
Question by: Volkhardt B
Dear garden expert, in October/November, my rose leaves featured black patches, even though I had sprayed them in September. For private reasons, I had no time to spray them again. Because all the leaves fell off, my question is what should I do in spring – wait to see what happens, or spray the first leaves as a preventative solution? In addition, I have added bark mulch in particular around the stems to protect against frost. Should I remove this again in spring?