Silphium laeve

At a glance

Lifecycle
Perennial (hardy)
Exposure
Full sun
Frost limit
−34.4 °C

Cultivation

We have very little information on this species and do not know if it will be hardy in Britain. The following notes are based on the general needs of the genus. Succeeds in any ordinary garden soil. Plants have a deep and extensive root system which makes transplanting difficult.

Propagation

Seed - best sown as soon as it is ripe in a greenhouse. Prick out the seedlings into individual pots as soon as they are large enough to handle and plant them out in the summer. Division in spring. This is very difficult due to the deep and extensive root system.

Edible uses

Root. No more details are given in the reports.

Habitat

Not known

Native range

N. America.

Same genus