Thuja occidentalis 'Trompenburg' is a slow growing, narrowly upright, dwarf selection of eastern arborvitae with dense, irregular, ascending branching holding sprays of yellow-green foliage than darkens somewhat in winter. After 10 years of growth, a mature specimen will measure 40 inches (1 m) tall and wide, an annual growth rate of 4 inches (10 cm).
This cultivar originated as a seedling selected in the mid-1980s by J.R.P. van Hoey Smith, who named it in honor of the famous arboretum in Rotterdam, The Netherlands.
