Q.Blackspots on miniature roses in garden..Help.
Why do my two mini roses keep getting blackspot? The leaves drop off and lucky to have one or two blooms. Did treat with blackspot solution, but it did not work. Are my plants beyond helping and start out with new plants?
Certified GKH Gardening Expert
Try giving neem oil a try. It is a good, organic pesticide and fungicide that might help. Here is more information:
This article should also help: https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm