A sophisticated, statuesque plant with a down-home name. Rarely found in gardens, but common in the wild where it is native (Southeastern...Read More Europe to Asia).
This species grows two to five years before flowering, each season producing a low rosette of glossy deeply divided leaves. The leaves bear a passing resemblance to celery or ground elder. The plant develops a massive tap root, so it's difficult/impossible to transplant except when very young.
When it's stored enough energy, it sends up a single well-branched, glaucous purple candelabra-like flowering stalk bearing few leaves but many flat umbels of pale yellow to chartreuse flowers. Flower stalks average 6' but can reach as much as 10'.
Despite its height, this is a see-through plant, suitable for the front of a border. It takes up very little garden space.
After setting seed, the plant dies, but it's said to self-sow liberally. If left by the gardener, the flowering stalk maintains its architectural presence into winter.
Authorities differ about the limit of its winter hardiness. I've seen credible sources list it as Z6, Z5, or Z4. I'm inclined to believe the last, as it came from a reputable nursery in VT, and other sources, too.
Prefers rich, well-drained soil and full sun, but tolerates partial shade.
Seed is short-lived and should be sown fresh. Requires cold dormancy.
A sophisticated, statuesque plant with a down-home name. Rarely found in gardens, but common in the wild where it is native (Southeastern...Read More