Alpine plants grow above the altitudinal tree-line in mountains around the world. Because alpine plants grow in areas with low summer and winter temperatures, very low night temperatures, frost, short growing-season, high winds, or extended snow-lie, and grow very slowly, it is widely accepted that alpines grow in such extreme habitats because of their physiological tolerance or requirement for cold conditions and/or their intolerance to competition from taller, more rapidly growing lowland or montane plants. Some, but certainly not all, alpines can, with care, be successfully grown in lowland gardens in the absence of competition from tall plants. Alpine plants are thus potentially sensitive to climate...