The Temperate Database is in the process of being updated, with new records being added and old ones being checked and brought up to date where necessary. This record has not yet been checked and updated.
Common Name: Giant Sumpweed
Cyclachaena xanthifolia is an annual plant that can grow up to 1.00 metres tall.
It has medicinal uses.
Most regions of N. America except the southeast and far north. A casual in Britain[
Disturbed sites: abandoned fields, bottomlands, flood plains, stream banks at elevations of 1 - 1300 metres[
We have very little information on this species and do not know its cultivation needs. However, it is likely to succeed in most soils that are not too heavy or wet and will probably prefer a sunny position.
The pollen of this species is one of the main causes of hay fever[
An infusion or decoction of the plant has been drunk and used as a lotion in the treatment of coughs and influenza[
]. A poultice of the plant has been used in the treatment of boils[
Seed - we have no information for this species, but suggest sowing the seed in a greenhouse in the spring, only just covering the seed and ensuring it does not dry out. Prick out the seedlings into pots once they are large enough to handle and grow them on in the greenhouse for their first year, planting them out into their permanent positions in late spring.