Thuja occidentalis 'Silveryana Nana' / dwarf silvery eastern arborvitae

Thuja occidentalis 'Silveryana Nana' is a dwarf, globose- to pyramidal selection of eastern arborvitae with upright branching and little tendency to form a dominant leader. Foliage is a combination of juvenile and mature types and grows with nice silvery variegation throughout the plant. After 10 years of growth, a mature specimen will measure 4 feet (1.5 m) tall and wide, an annual growth rate of 4 to 6 inches (10 - 15 cm).

This cultivar is fairly obscure, the name published in 1984 in the ACS ConiferQuartlerly by Robert L. Fincham. Large, old plants are known to exist in arboretums and a few large gardens. It is said to have been selected and introduced to the nursery trade by Jon Spaan of Washington State.

Thuja occidentalis 'Silveryana Nana' — an old specimen planted as a dwarf conifer over 50 years ago at the Bartlett Arboretum, Stamford, Connecticut. Photo from spring, 2020.
Photo by Katherine Wagner-Reiss
Thuja occidentalis 'Silveryana Nana' — a closeup of foliage detail.
Photo by Katherine Wagner-Reiss