A wide-spreading herbaceous perennial to 30cm in height, with dull blue-green leaves and dense flower spikes in late spring
0.1-0.5 metres
0.5-1 metres
| Season | Stem | Flower | Foliage | Fruit |
|---|---|---|---|---|
| Spring | ||||
| Summer | ||||
| Autumn | ||||
| Winter |
Tolerant of a range of soils from dry to wet in sun or shade. Can be prone to extensive spreading, especially in wet soils, by underground stems and therefore has the potential to become a nuisance. Ideal for containers where its spread can be restricted. See pond plants and bog gardens for further advice
Propagate by seed or division in spring or take semi-ripe cuttings of young basal shoots
Divide regularly to limit spread
Generally pest-free
Generally disease-free