The Common Peony (Paeonia lactiflora) is a hardy perennial that can be grown in Calgary. It is hardy in USDA zones 3-8, which includes the Calgary area. The ideal pH range for Peony is between 6.0-7.0, which is slightly acidic to neutral.To plant Common Peony, choose a location that receives full sun to partial shade and has well-draining soil. Dig a hole that is slightly larger than the root ball of the plant, and then backfill the hole with soil. Water the plant thoroughly after planting.
To maintain Common Peony, keep the soil consistently moist but not waterlogged. Deadhead spent blooms to encourage more flowers. Fertilize the plant with a balanced fertilizer according to package instructions. In late fall or early spring, prune back the plant to promote bushier growth and remove any damaged or diseased foliage.
It is best to plant Common Peony in early spring, as the soil is warming up and the risk of frost is low. The plant will bloom in late spring to early summer. The Common Peony is a heavy feeder and requires a lot of organic matter in the soil. Mulch the base of the plant with organic material to help keep the soil moist and add nutrients.
It is important to note that Common Peony has a deep taproot and prefers not to be disturbed so once planted, it is best not to move or divide them. Also, Peony are susceptible to powdery mildew, and in dry conditions, they may develop this fungal disease. Keeping the foliage dry, providing adequate air circulation, and avoiding overcrowding can help prevent the disease.