Thuja (Thuja) it can be a tree or a shrub of various shapes. Twigs with scales strongly flattened. Thuja seedlings have needles, which turn into scales with age. Small cones, elongated, composed of several pairs of scales.
The Korean thuja is a valuable species (Thuja koraiensis). It is a broad-growing shrub, low branched. Stems often dangling. The scales are light green on both sides, whitish stripes on the underside.
The western thuja is better known, which grows very slowly, and its varieties differ greatly in terms of growth force. It tolerates shading and haircuts quite well, therefore it is especially suitable for hedges. It is resistant to frost. It has low soil requirements, but is sensitive to drought.
Among the more interesting varieties, the following can be mentioned:
Thuja occidentalis albospicata, which has young white shoots;
Thuja occidentalis' Rheingold – with golden-yellow colored twigs at the ends;
Sulfur florid – tree growing up to 5 m, with a conical-columnar crown, golden-yellow twigs. Undisputed in terms of soil, frost resistant;
Sulfur column – with a narrow columnar shape, light green twigs, grows up to 8 m;
Thuja occidentalis ericoides – it has twigs not covered with scales, but with soft needles, forms dense and low, slightly spherical or conical, shrubs. Older shrubs require pruning to maintain their appearance.
Globosa – forms spherical bushes, not exceeding 2 m in height. Hoseri – is an eminently dwarf variety, also with a spherical shape. It grows very slowly, height 50 cm.