No pruning has been done since purchase 2 yrs ago. They are now quite large and last year they spread so much they exposed the middle.
Do You Prune Silver Mound in Spring
Certified GKH Gardening Expert
You will want to prune your silver mound in the summer after it blooms. I would recommend initially pruning back by up to a third of its height and spread.
For more information on the care of silver mound, please visit the following link: