Yellow dropping leaves on a mature holly tree
Hi-the holly tree in our front yard is great for the local birds but every spring nearly 30% of the leaves yellow & drop. Two years ago I googled the issue & found that an iron deficiency might be the issue. I bought an iron supplement specifically for holly trees & followed instructions but we are still having the issue. Any advice is appreciated-thanks in advance-
It is normal for hollies to shed their one year old leaves in the spring about the time the new growth is forming. Leaves may be yellow and have some fungal spots.
Scratch the branches with your fingernail and look for green tissue. If you see it, the branch is still viable. If brown, it is dead and you can prune. Wait to see if the new growth is looking good to determine if any other action is needed.