Abstract
Abstract The cold hardiness of eleven Acer taxa was determined by laboratory techniques. The red leaf cultivars of A. platanoides were less cold hardy than the green leaf ‘Emerald Queen.’ ‘Crimson Sentry,’ a branch sport of ‘Crimson King,’ exhibited similar cold hardiness to that of its parent. Among A. saccharum cultivars, ‘Legacy’ was the most cold hardy followed by ‘Green Mountain,’ ‘Commemoration’ and ‘Bonfire.’ ‘Green Column,’ a selection of black maple from a native Iowa population, developed −30°C (−22°F) midwinter cold hardiness but lost all cold hardiness [killed at −3°C (27°F)] by March. All sugar maple cultivars survived at least −9°C (16°F) on the March date. Of the hybrids of Acer platanoides and A. truncatum, Pacific Sunset™ was significantly more cold hardy than Norwegian Sunset™ and should be rated USDA Zone 4 and 5, respectively.
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