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Giant sequoia. Silvics of North America (1991), [1] a forest inventory compiled and published by the United States Forest Service, includes many conifers. [a] It superseded Silvics of Forest Trees of the United States (1965), which was the first extensive American tree inventory. [3]
The Jean Iseli Memorial Grant provides a $4,000 annual grant to a public garden or arboretum that has demonstrated its support of the development, conservation and propagation of conifers. The Society makes annual Reference Garden Grants to assist with development of conifer collections and has begun making Conservation and Research Grants.
Douglas-fir is one of the world's best timber-producing species and yields more timber than any other species in North America, making the forestlands of western Oregon, Washington, and British Columbia the most productive on the continent. In 2011, Douglas-fir represented 34.2% of US lumber exports, to a total of 1.053 billion board-feet.
Coast Douglas-fir is the fourth tallest conifer and fifth tallest of all trees in the world (after sitka spruce).Currently, coast Douglas-fir trees 60–75 metres (197–246 ft) or more in height and 1.5–2 metres (4.9–6.6 ft) in diameter are common in old growth stands, [4] and maximum heights of 100–120 metres (330–390 ft) and diameters up to 4.5–5.5 metres (15–18 ft) have been ...
Encyclopedia of Conifers. A Comprehensive Guide to Conifer Cultivars and Species is an encyclopedia written by Aris G. Auders and Derek P. Spicer, published in 2012. The two-volume, illustrated encyclopedia is a complete reference book covering all recognised conifer cultivars and species, both hardy and tropical.
'Beehive' – a very small dwarf shrub typically growing to 1 m (3 ft 3 in) high and 1.5 m wide, resembling a spreading beehive in form 'Bennett' – a dwarf shrub reaching 1 m (3 ft 3 in) high and 1.5 m (4 ft 11 in) wide, with upper branchlets that first ascend and then arch upper, this selection prefers partial shade.
The great majority of conifer genera and species are evergreen, retaining their leaves for several (2–40) years before falling, but unusual deciduous conifers occur in five genera (Larix, Pseudolarix, Glyptostrobus, Metasequoia and Taxodium), shedding their leaves in autumn and leafless through the winter.
The garden contains many smaller gardens and plant collections, including an herb garden, a medicinal garden, perennials, ferns and dwarf conifers. The original hardscape was constructed by Works Progress Administration in 1935 and persists to this day. [43]