Arnica montana Growing Guide
- Mountain arnica is hardy and can be grown successfully in zones 4–9.
- It has a preference for sunny areas but should grow fine in partially shaded areas.
- Grows best in sandy loams but will perform well in most soils as long as it is well drained.
- Space plants about 30 cm (12 inches) apart.
- Seeds are usually take about a month to germinate, but can take as long as two years. Lightly cover the seeds and sow in the late summer. If starting plants indoors, sow in pots and germinate at a temperature of ~ 55°F (13°C). Grow for one year before transplanting outdoors following the last frost.
- It is fairly easy to look after these plants as they are drought tolerant, but supply a stake in windy areas. Also cut back before flowering to keep stems short, and after flowering to produce a secondary bloom. Divide, in the spring or autumn, every three years to maintain vigour.
- Plants can be propagated by division or from cuttings in the spring. Take shoot cuttings when they are about 10 cm (4 inches) high.
- Arnica Spp. Can spread via their roots so may require close control to stop them taking over the garden.
- In addition to its medicinal uses Arnica montana are very attractive to bees and other insects, making them an ideal plant for people wishing to attract wildlife to their garden.