Q.What Causes Light Green/Yellow Leaves on Hydrangea
What causes light green/yellow leaves on hydrangea?

Heather
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 26, 2011
This sounds like Chlorosis. This article will help with that:
https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm
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