My hydrangeas have been yellowing for a couple of years. Up until now I‘ve treated them with an iron supplement. Note – Yellow leaves are a very different issue than ASTER YELLOWS.
After doing some research, I’m ready to work on some probable causes:
– lower the pH
– correct a drainage problem
– As always, I should be doing a soil test before doing anything else!
Here are three excellent articles on identifying and dealing with chlorosis:
Missouri Botanical Garden – Iron Chlorosis
Utah State University – what is Iron Chlorosis and What Causes it?
Government of Canada Agriculture – Iron Chlorosis
Hydrangea with yellowing leaves and green veins. Very typical of chlorosis.
Asiatic lilies in same bed are now showing symptoms
A product I’ve been using to treat symptoms
About The Author: Armstrong
As an author and editor, Linda directs her lifelong love of nature and plants to concerns about our environment and how we can do better. In addition to decades of gardening experience, and training as a master gardener, Linda focuses on learning from leading science-based educators and writers, and in the process finds that she uncovers many gardening myths.
More posts by Armstrong