
GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 19, 2020
Here are a couple articles that will help you solve the problem:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/growing-zinnia-flowers.htm
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