Sedum is a perennial flowering plant that's easy to care for. Autumn Joy is an upright cultivar that can be grown as a shrub. Blooming from August to November, Autumn Joy's flowers open in a lovely shade of mauve and turn a coppery bronze color just in time for fall. Divide the Autumn Joy sedum every three to four years or when the plant splits down the middle.
Water the sedum the day before dividing. Cut the plant to within 6 inches of the ground.
Insert a shovel or gardening fork into the ground in a circle around the plant, 4 to 6 inches from the base.
Pry the plant from the soil with the shovel and lift it from the ground. Shake it gently to remove loose soil and cut away any dead leaves.
Use a large knife or the shovel to slice the root ball in half. If the pieces are still large, slice them each in half again.
Plant the Autumn Joy sedum divisions quickly so they don't dry out.