- Herbaceous perennial
- USDA hardiness zones:
- Full sun to part shade
Winter hardy to USDA Zones 7-10 where it is easily grown in average, fertile, medium moisture, well-drained soils in full sun to part shade. Plants tolerate a wide range of soils except poorly-drained ones. Plants may not flower well in too much shade. Late spring frosts can impair or eliminate flowering for the year. Remove flowering stalks after bloom. In cold winter areas, plant foliage should be left in place over winter but removed in early spring as new foliage appears. Plants can spread aggressively by creeping rootstocks, particularly in loose soils. Unwanted spread can be addressed by root barriers. Plants generally spread less in the northern parts of their growing range. Plants are best propagated from root cuttings taken in early spring, but may be grown from seed. Plants can be slow to establish in the garden (particularly if started from seed), but become somewhat difficult to eradicate once established since small sections of root left behind can sprout new plants. This plant is not reliably winter hardy to the St. Louis area. If attempted in St. Louis, it should be sited in a protected location and mulched.
Size and growth:
- 3.0 to 5.0 feet
- 2.0 to 3.0 feet
Bloom / flowers:
- June - July
- White (sometimes pink)
Has thorns, Showy flowers, and White
Southern Europe, northwestern Africa
Bold, stately plants that may be grown as specimens but are perhaps best in small groupings. Borders or formal gardens. For the St. Louis area, A. spinosus (see A100) is a similar plant with better winter hardiness.
No serious insect or disease problems. Snails and slugs are occasional visitors that can do substantial damage if left unchecked. Plants can spread aggressively in optimum conditions.