(E = evergreen)
Thujas thrive on most well-drained soils but despise shallow, dry ones. They form excellent screens up to 35 ft. If carefully grown, some thujas also make good hedges; they grow quickly and can be clipped hard like yew.
Thuja occidentalis. The soft green foliage turns a rusty red in winter, reverting to green again in late spring. When bruised, this thuja emits a strong, tansy-like odour, particularly noticeable when clipping. For a hedge (5 to 10 ft.), put in 2- to 3-ft. high plants 1-½ to 2 ft. apart in October or April. Trim in early autumn. When planting a screen, insert the plants 6 to 9 ft. apart; the alternate ones need not necessarily be removed later.
T. plicata. For a hedge (6 to 20 ft.), put in small plants 1-1/2 to 2 ft. high in October or April, spacing them 1-1/2 to 2 ft. apart. Trim in late summer, with increasing severity as the plants grow, clipping only the sides until the required height is attained. Plants for screens should be put in 4 to 8 ft. apart; remove alternate plants when the branches touch.
T.p. Zebrina, a comparatively new, golden form. Up to 12 ft. as a hedge. Otherwise its characteristics and requirements are similar to those of T. plicata.