Evergreen Conifer Plants, Thuja Smaragd, compact hedging, hardy, 10 x 9cm potsEvergreen Conifer Plants, Thuja Smaragd, compact hedging, hardy, 10 x 9cm pots The best well behaved evergreen conifer hedge! Thuja are evergreen conifer trees with a narrow, conical habit, and Thuja occidentalis 'Smaragd' is a beautiful example of this highly decorative tree. A slow growing, ornamental shrub with erect sprays of bright green, aromatic foliage, the Emerald Thuja is a colourful way to add height and structure to your beds and borders.