Evergreen groundcovers can look pretty tattered after the ravages of winter. Cut back ugly foliage before the new foliage emerges. For clusters of liriope and other short grasses, run the lawn mower over the bed. This can also be done with pachysandra and vinca minor (periwinkle). The plants will look a little bare for a couple of weeks, but soon the perfect new foliage will appear.
This is a perfect time to install new beds of groundcovers. Betty's has an extensive Groundcover Care Sheet to explain which groundcover to use, how many plants you'll need for your area, and how to install.
Feed beds of groundcover now with slow-release granular food such as Start-N-Grow.