[Overview]
A perennial.
Tubers often form underground, and it is also treated as a bulb plant.
One to several thick stems stand erect, and the stems branch sparsely.
The leaves are simple and alternate, lanceolate to linear, with entire margins.
It produces long spike-like, raceme-like or panicle-like inflorescences bearing many flower heads (capitula).
The flower heads consist only of tubular flowers, and usually begin to open from the tip of the inflorescence.
The fruit is an achene.
[Cultivation]
Propagate by division and from seed.
It prefers a sunny, well-drained, fertile soil.
Depending on the species, some prefer dry ground and others prefer moist places.
