Every year my two Japanese holly trees get berries but they never get red. Can you tell me why this is so? Thank you.
Certified GKH Gardening Expert
There is a pest called a holly berry midge. It gets into the berries of hollies and they will not turn color when they are infested with them. I suspect that this may be your problem. This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-berry-midge-pests.htm