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Over 200 cultivars have been selected, varying in size from trees as large as the wild species, down to very slow-growing dwarf plants under 30 cm (12 in) high. A few of the best known are listed below. [6] [7] [8] Those marked agm have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017). [9]
It is a slow-growing coniferous tree growing to 35–50 m tall with a trunk up to 2 m in diameter. The bark is red-brown, vertically fissured and with a stringy texture. The foliage is arranged in flat sprays; adult leaves are scale-like, 1.5–2 mm long, with pointed tips (unlike the blunt tips of the leaves of the related Chamaecyparis obtusa (hinoki cypress), green above, green below with a ...
A slow-growing and long-lived pioneer species that helps reduce the movement of soil and snow. The seeds are a source of nutrition for birds, small mammals, black bears and grizzly bears . Uses: no significant economic uses [ 63 ] [ 64 ]
'Conica' is a dwarf conifer with very slender leaves, like those normally found only on one-year-old seedlings, and very slow growth, typically only 2–10 cm (3 ⁄ 4 –4 in) per year. Older specimens commonly ' revert ', developing normal adult foliage and starting to grow much faster; this 'reverted' growth must be pruned if the plant is to ...
In some instances, trees with heights in excess of 20 m (66 ft) occur in parks and other protected areas, quite often in gullies. The tree is extremely slow growing, and has a habit of rotting from the inside, creating hollow forms. This makes it difficult and sometimes impossible to make accurate ring counts to determine a specimen's true age.
Like most endemic alpine conifers to Tasmania, the growth rate of Pherosphaera hookeriana is extremely slow. Plants that have a stem diameter of 3–6 cm having an estimated age of 250–300 years on Mawson Plateau in Mt Field National Park (Minchin 1983) with the actual maximum ages likely exceeding 500 years.