Senecio sylvaticus aka Heath Groundsel

Senecio sylvaticus is an annual in the daisy family, Asteraceae. Its common names include heath groundsel and wood groundsel. It grows naturally across Macaronesia and Europe, reaching the Caucasus. It is native to Britain and Ireland. Kew places it in the temperate climate zone. Its native range spans northern, central, and southern Europe. Recorded sites include the Madeira Islands, off the African coast.

The plant reaches about 2 feet (0.6 metres) in height. Its spread also reaches about 2 feet (0.6 metres). It has an unpleasant smell, according to Plants For A Future. Flowers appear from July through August. Seeds then ripen from August through September. Each flower has both male and female organs. Bees and flies pollinate the flowers. The species is also self-fertile, so it can set seed without another plant.

In the wild, it grows among open vegetation. Its habitats include dry heaths and areas of common land. It occurs on sandy or gravelly ground that lacks lime. For cultivation, it needs an open site without shade. It accepts sand, loam, and clay, provided water drains well. Mildly acid or neutral soil suits it. Soil may be dry or moist. It also tolerates exposure to coastal conditions. Plants For A Future lists USDA zones 5–9.

Plants For A Future lists meadows and cultivated beds as planting sites. Its flowers offer a food source for bees and flies. Birds eat its leaves and seeds, adding to its wildlife value. Some mammals also feed on it, despite its toxic effects. Rabbits appear less affected and may seek it out. Sow seed directly where the plants will grow in spring. The source records no other practical uses for this species.

All parts contain poison that can harm humans and many mammals. The toxin damages the liver, and its effects build over time. Reports of rabbits eating it do not establish safety for people. Plants For A Future records no edible use. It notes past medicinal uses for scurvy and cleansing. These records do not remove the risk of poisoning. Its value as a wildlife plant must be weighed against that risk.