Propagation is by the formation of new corms from the parent corm, and by seeds.
The corms should be planted not less than 3 in.
In some cases a single corm produces several new plants during its second spring by giving rise to immature corms.
In the 17th century the corms were worn by some of the German peasantry as a charm against the plague.
New corms are produced at the end of the season, and by these the plant is multiplied.