Position: full sun or partial shade
Soil: moderately fertile, moist, well-drained soil
Rate of growth: average
Flowering period: July to August
Hardiness: fully hardy

Self-supporting spires of bluey-mauve flowers from July to August above whorls of deep green leaves. The delicate, tubular flowers add vertical interest to the back of a border and associate well with prairie style planting. Best grown in a fertile, moist, well-drained soil in full sun or partial shade.
 
Garden care: Divide plants in spring. Apply a generous 5-7cm mulch of well-rotted garden compost or manure around the base of the plant in spring.