Propagation | Sow fresh seed in containers with germination in 1-2 weeks at 65-75°F (18-23°C). Can also be done by division. |
Cultivation | Grows in well-drained, dry to moist soil in full sunlight. Can tolerate sandy soils. |
Pests | Slugs, snails and powdery mildews. |
Notable Specimens | The Gardens of Fanshawe College, London, Ontario, Canada and The A.M. Cuddy Gardens, Strathroy, Ontario, Canada. |
Habitat | Central and eastern North America |
Leaf Description | Linear leaves 15–100 cm long but only 1–3 cm broad, with bristly or spiny margins and a sharp tip. |
Flower Description | The flowers are produced in dense apical umbels 1–3 cm diameter, each flower greenish-white or bluish-white, 3–4 mm diameter. |