Korean ArborvitaeThuja koraiensis

Water Thuja koraiensis regularly, especially during dry spells and the first few years after planting. Aim for consistently moist, but not waterlogged, soil.

Reduce watering in winter when growth slows, but ensure the root ball does not dry out completely. Deep watering is more beneficial than frequent shallow watering.

Prune Thuja koraiensis in late winter or early spring before new growth begins. Remove dead, damaged, or crossing branches.

Light shaping can be done to maintain desired form, but avoid cutting back into old wood as it may not regrow. Heavy pruning is generally not recommended.

Propagation of Thuja koraiensis is typically done from seed or semi-hardwood cuttings. Seeds require stratification.

Cuttings should be taken in mid-summer and treated with rooting hormone, then planted in a well-draining propagation mix. Patience is key for successful propagation.

Repot young Thuja koraiensis plants every 2-3 years, or when they become root-bound. Spring is the ideal time. Choose a pot one size larger with good drainage.

Use a well-draining potting mix, such as a blend of peat moss, perlite, and compost. Water thoroughly after repotting.