When you're finished digging in the materials, rake the area level again and clean the overflow soil from around the edges. Once the soil is properly prepared the plants can be replanted in their proper locations. Remove soil from the roots by shaking vigorously or washing the roots off with water. Removal of the soil allows a better view of the crown and roots for division. It is also the only way to remove grass and weeds from within the perennial clump.
Perennials require different techniques and tools for division.
Some plants can be pulled apart by hand, others require a sharp knife, still others a sharp spade. After division, set out the plants on the soil and arrange them according to your garden plan and taste. Make sure to allow adequate space between plants for good growth, maintenance paths, and annual flowers you want to use. Once the arrangement is to your liking, begin planting. If the sun is shining and temperatures are warm, make decisions on plant placement and planting quickly to prevent the plants from drying out.