Red Valerian

Centranthus ruber

Clusters of rosy-red flowers on upright stems; thrives in poor, dry soils and walls.

Sunlight Full Sun

Water Low

USDA zones 5–9

Planning spacing 1.5 ft

Typical mature size 3 ft tall, 2 ft wide

Typical bloom Late spring - early fall

Red Valerian spacing and mature footprint

Space Red Valerian 18 inches apart, measured center to center (45 cm).

The mature spread is about 2 ft (60 cm), so plants set at that distance grow together into a solid mass.

Treat 18 inches as a planning baseline — cultivar and local growing conditions shift the final footprint.

Three plants set 1.5 ft apart, center to center; shaded circles show the 2 ft mature spread.