Parthenium integrifolium (Wild quinine) 9 cm pot

Growth habit & appearance:Parthenium integrifolium, known as Wild Quinine or Eastern Feverfew, forms a robust clump of upright stems topped with tight, chalk-white clusters of resinous flowers. Its foliage is thick, leathery and softly textured, giving the plant a distinctive medicinal presence. This American prairie perennial is long-lived, visually bold, and well suited to naturalistic herb borders.

Growing conditions:This hardy perennial tolerates Irish conditions well, thriving in full sun to part shade and coping with both moderately dry and heavier soils once established. Plants die back fully in winter before re-emerging in spring. As with all hardy stock grown here in Co. Clare, these plants are already acclimatised to Irish weather patterns and transplant readily into open ground.

Traditional & herbal uses:The leaves and roots have a long record of use in North American herbal traditions. Leaves were applied as poultices for burns and skin irritation. Modern phytochemical studies show the plant contains sesquiterpene lactones and parthenolide-like compounds associated with immune-modulating and anti-inflammatory effects. Research indicates potential activity in supporting lymphatic tone, easing congestion, and assisting upper-respiratory complaints such as coughs and colds. Traditionally, it was also used during feverish states and for general immune support. Roots of older plants (4–5 years) were often selected for stronger preparations.

Maintenance & harvesting:Wild Quinine is a low-maintenance perennial—mulch in autumn or spring to stabilise soil moisture and suppress weeds. Deadhead spent flower heads to prolong blooming. Leaves can be harvested throughout summer and dried. For root harvesting, only mature 4–5-year plants should be lifted, selecting strong sections and replanting divisions to maintain the stand.