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Arnica (Arnica montana or leopard's bane) is an herb that is native to Europe and Asia. It grows wild in cool, mountainous regions, such as Colorado, up to 8,000 feet in elevation. It's also known as mountain snuff and mountain tobacco.
How to Grow Vinca or Periwinkle Plants. Vinca or Periwinkle is a prolific heat and drought tolerant annual, perfect for hot, dry areas. It's easy to grow, and requires little or no attention. A grower once reported that he has grown Vinca in the same location for 30 years. It successfully reseeded itself each year, with no effort on his part.