In its native habitat (certain parts of the Sierra Nevada in California), the most massive living organisms in the world (wait, what about clonal quaking aspen colonies?). Unfortunately prone to Cercospora leaf spot and Kabatina tip blight in the more humid climate of the East.
Lower branches will sometimes naturally layer. Trunks may be buttressed with time.
Prefers cool, consistently moist climate. Needs deep soil. Clay tolerance is debated (Cal Poly vs. USDA).
'Hazel Smith' was selected in North Jersey for blue foliage and greater hardiness than the species. 'Pendulum' is (of course) weeping and has been compared to the trees of Dr. Seuss. 'Glaucum' is a bit slower and narrower than the species and (of course) blue. 'Greenpeace' is brighter green, dense and compact, growing about half as fast as the species. 'Von Martin' is very dense and compact, growing about a quarter the rate of the species.
Sources: Sunset, UFL, Missouri BG, Cal Poly, AHS, USDA, Dirr/Warren.
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