Arnica

Arnica montana, also known as mountain arnica or leopard's bane, is a moderately toxic perennial flowering plant in the daisy family (Asteraceae) native to the mountainous meadows of Europe. It produces bold, bright yellow flower heads on upright stems and has long been cultivated for its use in herbal medicine. The plant demands nutrient-poor, acidic, well-drained soil and is considered challenging to establish, making it a choice for experienced gardeners. In Sweden it is red-listed and increasingly rare in the wild.

Growing

Start seeds indoors under cool conditions once the soil medium reaches around 10 °C; press seeds lightly onto the surface and cover with no more than 2 mm of fine compost, as light aids germination. Expect germination in 3–6 weeks. Grow on at cool temperatures and harden off seedlings thoroughly before transplanting to a permanent position once nights remain reliably above 5 °C. Space plants 30 cm apart in an open, sunny position with lean, acidic, sandy soil; avoid fertilising. Arnica typically flowers in its second year from seed.

Care

Water sparingly — arnica is adapted to dry, nutrient-poor conditions and will rot in waterlogged or fertile soil. Do not feed with any nitrogen-rich fertiliser. Remove competing weeds gently by hand to avoid disturbing the shallow root system. Deadhead spent flowers to encourage the plant to persist, but leave some flower heads to self-seed if naturalising is desired.

Harvest

Harvest flower heads when they have fully opened and the petals are spreading flat, cutting stems close to the base with sharp scissors. Harvest promptly as the window is short — flowers deteriorate quickly once past peak. Collect in the morning after dew has dried. Harvest only what is needed and leave the majority of flowers on the plant to support perennial vigour.

In the kitchen

Arnica montana is moderately toxic and is not used in cooking or eaten. It is cultivated exclusively for ornamental and herbal medicinal purposes. Dried flower heads are used in external preparations such as tinctures, creams and poultices for bruising and muscle soreness — always under appropriate guidance and never taken internally.

Storing

Dry harvested flower heads in a single layer in a warm, well-ventilated space away from direct light until fully desiccated. Store dried flowers in an airtight glass jar in a cool, dark location; they retain potency for up to one year. Do not refrigerate dried material, as moisture will cause deterioration.