Q.My Holly Tree Is Losing It’s Leaves.
Every spring the leaves turn yellow and fall off. The tree is very sparse. I have removed all the mulch from around the tree and used a fertilizer to try and help it, but there is no new growth. I don’t know what else to do to help the tree.

Certified GKH Gardening Expert
A soil test will help. Here are some reasons for yellow leaves:
https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-leaf-loss-in-spring.htm
https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-yellow-leaves.htm