How to divide and replant ornamental grasses
Before Digging Up Ornamental Grass
Prune ornamental grass to about 4 inches above the ground in late winter. Short grasses can be clipped with hedge clippers while tall grasses, which may have sturdy stems, can be cut back using a saw or hand pruners.
How to Dig Up Ornamental Grass
Dig up the clump by pushing a garden spade straight down about 6 inches from the crown of the plant, where the stems meet the roots. Continue digging down and around the plant. A knife or hand pruners may be needed to sever long reaching roots. Force the spade beneath the plant and lift it out onto the ground.
Dividing the Clump
Use the point of the spade or a saw to divide the clump into four fairly equal sections. Pull or cut off and discard the portion of each section that was previously the center of the plant.
Replanting the Divisions of the Ornamental Grass Clump
Replant the sections in the same sunlight condition, like full sun, by digging a hole as deep as the root ball is tall. Dig the hole twice as wide as the root ball to loosen soil for better root penetration. Place the root ball in the ground so the top of the root ball is level with the ground. Adjust the amount of soil in the bottom of the hole if needed. Backfill the hole with the removed soil. Water the newly planted sections and cover the area with 2 to 3 inches of mulch, like pine chips.