Black Eyed Susan, Coneflower, Gloriosa Daisy, Marguerite Jaune

Rudbeckia hirta

Physical Characteristics

Rudbeckia hirta is a BIENNIAL/PERENNIAL growing to 2 m (6ft) by 0.5 m (1ft 8in) at a medium rate. See above for USDA hardiness. It is hardy to UK zone 4. It is in flower from July to October, and the seeds ripen from August to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, hoverflies. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil. The plant can tolerates strong winds but not maritime exposure.

Distribution

N. America. An occasional garden escape in Britain[17].

Habitats

Cultivated Beds;

Edible Uses

None known

Medicinal Uses

An infusion of the roots has been used in the treatment of colds, dropsy and worms in children[257]. A warm infusion of the root has been used as a wash on sores and snake bites[257]. The ooze from the roots has been used as drops to treat earaches[257].

Known Hazards

This plant is reputed to be poisonous to cattle, sheep and pigs[155].