
Anonymous on
May 26, 2011

Nikki on
May 27, 2011
Certified Expert
Are they in the ground or in a container? If they are in a container, it is likely black spot fungus. Treat them with neem oil. Here is more information on neem oil: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm