Thuja standishii x plicata 'Green Giant' / Green Giant arborvitae

Thuja standishii × plicata 'Green Giant' is a very fast growing selection of hybrid Arborvitae. It forms a narrowly conical to pyramidal tree with sprays of rather open foliage, rich glossy green above, paler green below. Typical rate of growth in most areas is up to 5 feet (1.6 m) per year, resulting in a large tree 50 feet (15 m) tall by 5 feet (2 m) wide after 10 years in the landscape.

D.T. Poulsen nursery of Copenhagen, Denmark, selected and introduced this cultivar in the mid-1960s. It is marketed as a very effective tree for screening and is regarded as a hardier substitute for Leyland cypress (Cupressus × leylandii), particularly in North America.

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Attribution from: Aris Auders and Derek Spicer, RHS Encyclopedia of Conifers, Kingsblue Press ©2012

Thuja plicata x standishii 'Green Giant' — a spacing illustration, on the grounds of The US National Arboretum, Washington, D.C., during the first week of May, 2006;
Photo by Dax Herbst
Thuja plicata x standishii 'Green Giant' —at the Gotelli Collection, US National Arboretum, Washington, D.C.
Photo by Dax Herbst

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