Peucedanum oreoselinum aka Peucedanum Oreoselinum

Peucedanum oreoselinum belongs to the carrot family, Apiaceae. It is a perennial, so it lives for several years. Its native range covers Europe and the northern Caucasus. Kew places it in the temperate climate zone. The RHS uses the name Oreoselinum nigrum. It lists Peucedanum oreoselinum as another name for that plant. Both names thus mean the same plant in these records. The RHS says it is not native to Britain or Ireland.

Plants For A Future gives a height of 3.3 feet [1 metre]. The records give no mature width or growth rate. They give no details of leaves, stems, or roots. They do not state flower colour or bloom season. Each flower has both male and female organs. Insects carry pollen between flowers. The plant is self-fertile: it can set seed with its own pollen. The sources do not describe the fruit or seeds. These gaps leave parts of its garden form unclear.

The species entry says it needs sun and cannot grow in shade. It says the plant prefers moist soil. It can grow in sand, loam, and clay soils. The stated pH range runs from mildly acid to mildly alkaline. Plants For A Future lists USDA hardiness zones 4–8. Yet its growing notes question whether it is hardy in Britain. Those notes draw on the wider genus, not this species. They are not firm growing advice for this plant. The evidence gives no tested plan for when to water. It does not say how well the plant withstands drought.

Plants For A Future lists the plant for use in garden beds. It also lists it among plants grown for scent. The plant yields an essential oil, but few details follow. The source does not name the part that yields the oil. Nor does it say how people use that oil. It notes use as a diuretic, to increase urine flow. It gives the plant a low rating for medicinal value. This reported use does not prove that treatment is safe. The account lists no known use as food.

The source gives no finding on toxicity for this species. Its warning about sap concerns other plants in the genus. That warning alone does not show this plant is toxic. Nor does it show that this plant is safe. The material names no pests or diseases specific to this species. It gives no detailed account of problems in the garden.