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Arnica (arnica montana)
A plant growing wild in mountainous areas of North America and Europe - where it"s a protected species - it"s a hardy perennial, growing up to 60cm/2 ft, with oval, hairy light-green leaves and scented yellow flowers. The name derives from the Greek word "ptarmikos" meaning sneezing. One sniff can make you sneeze.
Arnica grows well in this country, but is happiest in sandy acid soil, and in a sunny position; it"s ideal for rock gardens as its flowers have a long season.