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Common Name: Black Eyed Susan
Rudbeckia hirta is a Biennial/Perennial up to 2.00 metres tall.
It is harvested from the wild for local use as a medicine and source of materials..
This plant is reputed to be poisonous to cattle, sheep and pigs[
N. America - most areas apart from the far north. An occasional garden escape in Britain[
Disturbed soils in Texas[
]. Open woodlands, fields and roadsides at elevations of 30 - 300 metres[
Dormant plants are hardy to about -25°c[
Succeeds in an ordinary medium soil in sun or shade[
]. Requires a moist soil[
]. Prefers a well-drained soil[
This species is a biennial or short-lived perennial[
Some named forms have been selected for their ornamental value[
Members of this genus are rarely if ever troubled by browsing deer[
An infusion of the roots has been used in the treatment of colds, dropsy and worms in children[
]. A warm infusion of the root has been used as a wash on sores and snake bites[
]. The ooze from the roots has been used as drops to treat earaches[
Most membes of this genus are rich sources of phytochemicals that may offer potential for pharmaceutical or other uses[
A yellow dye is obtained from the flowers[
Seed - sow mid spring in a greenhouse. Only just cover the seed. Germination should take place within 2 weeks, prick out the seedlings into individual pots when they are large enough to handle and plant them out in the summer[
]. The seed can also be sown in situ[