We have planted Zinnias successfully for many years but this years group is not growing as tall as before and the flowers are not very vivid. Looking at them a little closer today, I noticed holes in the leaves and flowers as well as some brown patches on the leaves. Do you have any ideas on what the issue might be and how to treat it?
Oakland County Michigan
The holes in leaves and flowers could be caused by insects - aphids, earwigs, etc. you can sometimes detect earwigs at night when you shine a flashlight on your plants. The brown spots could be caused by a fungus. Use of a fungicide may help.