Q.Why Are My Zinnia Leaves Are Drying Up And Turning Brown?
My zinnia plants have been in the ground less than a week and already the leaves are drying up and looking terrible. Am I overwatering? We’ve also had quite a bit of rain recently. Or is this something else, like powdery mildew? Thank you!
Certified GKH Gardening Expert
If you have had rain, AND are watering- Yes, it has been very overwatered. The soil needs to dry completely to about 3 inches in ground before it receives water, ideally.
Overwatering will, first, suffocate the roots. This will lead to infection, which is what you are seeing now.
There are a few things that will need to be done, but it probably won't correct the issue this yea. It will help with the next planting, though.
First, I recommend treating with a fungicide/bactericide. There is a lot of overlap and it can be difficult to pin down an exact ID of the pest, so a fungicide is a better option if you do not not the pest in question.
This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
I would recommend, most of all, a biofungicide. This is another group of microbes that will fight for your plant in the soil. They can, also, help prevent future infections. This article will help:
Once the soil has been treated, you will have much better success, even during the rainy seasons!
This article will help you with the general care of Zinnias: