Q.what is a time to trim Lirope
We have had problems with getting liriope to look good and we are not sure when to trim it in the spring here in PA.

You can cut the liriope (monkey grass) back to 3 inches in early spring. After trimming, you can fertilize and implement weed control as well. Then, mulch the area with straw, bark or compost.
For more information on pruning liriope please visit the following link:
https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/pruning-monkey-grass.htm