Q.How can I get my holly bush to produce red berries?
How can I get my holly bush to produce red berries?

Certified GKH Gardening Expert
In order to get berries on your bush, you'll need to have both male and female shrubs. These articles will help: https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-bush-no-berries.htm
https://www.gardeningknowhow.com/ornamental/shrubs/holly/how-to-tell-the-difference-between-a-male-and-female-holly-bush.htm

You may have done the same thing that I did ---prune wrong time of the year--also berries grow on 2 year old growth_______for me insult to injury is my neighbor has a tall holly tree that is covered with berries and they totally ignor it !!!!!!!!!!!!!!!!!