An erect, clump-forming, short-lived perennial with alternate, entire, stiffly hairy, linear-elliptic to lanceolate leaves which are sessile or clasping at the base. In late spring to early summer, intense blue flowers are borne in terminal spikes rising above the foliage.
0.5-1 metres
0.1-0.5 metres
| Season | Stem | Flower | Foliage | Fruit |
|---|---|---|---|---|
| Spring | ||||
| Summer | ||||
| Autumn | ||||
| Winter |
Grows in any moderately fertile, moist but well-drained soil in full sun, although it can also tolerate partial shade. It thrives in moist soils but dislikes winter wet. Plants may require staking.
Propagate by seed, root cuttings in winter or by softwood cuttings from the base of young shoots in spring.
Dead-head after the first flush of flowers to encourage a second flush. Cut back top-growth after flowering to encourage the development of overwintering basal rosettes.
Generally pest-free
Can be susceptible to powdery mildews