Sedum 'Purple Emperor,' also referred to as showy sedum or stonecrop, is a succulent with dark purple foliage and rose-colored blooms that appear in late summer to early fall. This variety of sedum grows up to 15 inches tall and 12 to 23 inches wide. The foliage of sedum 'Purple Emperor' fades to an attractive, dark brown shade during late fall and winter and adds an interesting touch of color to the yard during cold weather. This plant does well with very little attention and is hardy in USDA Zones 4 to 9.
Dig a hole twice the diameter and the same depth as the container that the sedum 'Purple Emperor' was purchased in. Place the root ball into the hole at the same level it was previously growing, and replace the soil. Pat down firmly to remove air pockets.
Water until the soil is very moist, but not soggy. Continue to add moisture whenever the top inch of soil no longer sticks to your finger.
Pinch the foliage back to half its height in June to promote more compact, bushier growth.
Clip off dead or damaged branches as you notice them. Remove the previous season's growth in early spring, after the new green growth starts to appear at the base of the plant.
Examine the plant often for signs of pest infestation. Slugs are the most common garden pest to affect sedum. If you notice any on or near the plant, destroy them promptly and place slug baits around the affected plants.
Divide sedum 'Purple Emperor' when the plant begins to split in the middle and the blooms no longer remain upright.