Royal Catchfly (Silene regia) is a seasonal interest plant with red flowers that bloom from early summer to fall. They prefer moist to dry soil in sun to part sun, growing up to 3 feet tall. If the soil it too fertile, they may tend to flop when blooming. They are a great choice for banks and slopes. Companion plants include Rosinweed (Silphium integrifolium) and Prairie Dropseed (Sporobolus heterolepis).
Plants may need staking once blooming begins in summer. Soils should be well-drained for optimal growing conditions.