Prepare the Soil before You Plant Groundcover
Eliminate all weeds and grass from the area before planting. For large areas, use glyphosate herbicide, such as Roundup® Weed & Grass Killer Ready-To-Use Plus, to kill weeds or grass in the area you're working in. You could also use a rototiller, or a rented sod-stripping machine to clear the area of plants and grass. Some people also take the extra step of solarizing the soil by laying clear plastic over cleared and moistened soil (so the sun's heating rays can penetrate and heat the soil). Seal the edges with soil, and leave the plastic in place for 4 to 6 weeks.
Space Plants and Dig Holes
To know how many plants you'll need at various distances, use the following as a guide: 100 plants spaced 6 inches apart cover about 20 square feet; 12 inches apart, they'll cover 85 square feet; and 18 inches apart, they'll cover 200 square feet. Arrange plants in zigzag rows so they are equal distance from their neighbors. Dig holes to the same depth as, and two to three times wider than, the plants' root balls.
Plant Your Groundcover
Water plants thoroughly a few hours before planting. If weeds are severe, consider covering soil with a water-permeable landscape fabric. Tip each plant out of its pot without pulling on the stems. Untangle circling roots gently with your fingers. Place in the hole so that the plant will grow at the same soil level as it did in the pot. Spread the roots and backfill with the soil that was removed from the hole. Press the plant gently into place.
Water and Mulch Your Groundcover
Water plants thoroughly after planting to settle the soil. Spread 2 to 3 inches of shredded bark, such as Scotts® Nature Scapes® Color Enhanced Mulch. If using landscape fabric, cover it with 1 to 2 inches of mulch. Pull the mulch 6 inches away from the plant stems. Maintain even soil moisture until the plants resume vigorous growth - usually in 1 to 2 growing seasons. Pull weeds as they appear and replace mulch as needed.
Feed Your New Groundcover
Speed plant growth by scattering a slow-release granular fertilizer, such as Miracle-Gro® Shake 'n Feed® Continuous Release All Purpose Plant Food or composted manure over the planting site. Choose a fertilizer formulated for your plants and follow directions carefully.
Article provided by the National Gardening Association. Photos provided by Sabin Gratz of the National Gardening Association
When Planting Shrubs, Use Fabric to Prevent Weeds
Prevent weeds by laying down a water-permeable landscape fabric. Overlap the edges by a few inches and anchor the fabric to the ground with wire or plastic pegs made for the job. Fabric is best used with shrubs, but not perennials with a creeping habit. To plant, make two crossing cuts in the fabric with a sharp knife, pull up the flaps, and plant through the opening.