Silphium — 4 species
Botanical species in the genus Silphium recorded in the PlantPeers database.
Silphium laciniatum
Silphium laciniatum
Family: Asteraceae
Cultivation
Silphium laciniatum is a very cold-hardy plant, able to tolerate temperatures down to around -30°c when fully dormant. Succeeds in sun or dappled shade, preferring a shady position. Succeeds in any ordinary garden soil.
Full cultivation guide →Silphium laeve
Silphium laeve
Family: Asteraceae
Cultivation
We have very little information on this species - see the notes above on taxonomy. Species in the genus Silphium succeed in any ordinary garden soil, preferring a deep moisture retentive moderately fertile soil that is not too nitrogen rich, in sun or dappled shade. Plants have a deep and extensive root system which makes transplanting difficult.
Full cultivation guide →Silphium perfoliatum
Silphium perfoliatum
Family: Asteraceae
Cultivation
Silphium perfoliatum is a very cold-hardy plant, able to tolerate temperatures down to around -30°c when fully dormant. Succeeds in any ordinary garden soil. Prefers a deep moisture retentive moderately fertile soil that is not too nitrogen rich, succeeding in full sun or dappled shade.
Full cultivation guide →Silphium terebinthinaceum
Silphium terebinthinaceum
Family: Asteraceae
Cultivation
Silphium terebinthinaceum is a very cold-hardy plant, able to tolerate temperatures down to around -30°c when fully dormant. Succeeds in any ordinary garden soil. Prefers a deep moisture retentive moderately fertile soil that is not too nitrogen rich, in sun or dappled shade.
Full cultivation guide →