Growing Thuja - Clay-Based Well-Draining Substrate, Sunny Location or Partial Shade, Generous Watering
Thuja, also known as arborvitae, is a popular evergreen conifer that adds year-round beauty to gardens, hedges, and landscapes. With proper care and attention to growing conditions, thuja develops into a dense, healthy plant that provides excellent privacy screening and ornamental value.
Optimal Substrate for Thuja
Thuja thrives in clay-based well-draining substrate that retains moisture while preventing waterlogging. The ideal soil composition includes:
- Loamy soil with good structure
- pH level between 6.0-7.5 (slightly acidic to neutral)
- Rich in organic matter for nutrient retention
- Adequate drainage to prevent root rot
Before planting, improve heavy clay soils by incorporating compost or well-rotted organic material. For sandy soils, add clay-based components to improve water retention.
Light Requirements - Sunny Location or Partial Shade
Thuja is versatile regarding light conditions and adapts well to different exposures:
- Full sun: Produces the densest, most compact growth
- Partial shade: Tolerates 4-6 hours of direct sunlight daily
- Avoid deep shade, which leads to sparse, open growth
For hedge plantings, ensure all plants receive similar light exposure for uniform growth and appearance.
Watering Requirements - Generous Irrigation
Generous watering is essential, especially during the establishment phase and hot summer months:
- Water deeply and thoroughly, reaching the entire root zone
- Newly planted thuja requires regular watering for the first 1-2 years
- Established plants need consistent moisture during dry periods
- Apply mulch around the base to retain soil moisture
- Avoid waterlogged conditions which can lead to root diseases
During winter, water evergreen thuja on mild days when the ground isn't frozen, as they continue transpiring and need moisture year-round.
Additional Care Tips
Beyond substrate, light, and water requirements, thuja benefits from:
- Annual fertilization in early spring with balanced evergreen fertilizer
- Light pruning to maintain shape and density
- Protection from harsh winter winds in exposed locations
- Regular inspection for pests and diseases
With proper attention to these growing requirements, your thuja will develop into a beautiful, healthy specimen that enhances your garden for many years to come.
THUJA
Thuja can reach a height of 5-6 m. Mature trees reach 10-12 m. The leaves are green with yellow shades. The crown is regularly branched and conical. Older branches have brown leaves. When crushed, the twigs smell pleasant (ingestion of the fragrant parts is dangerous). Male cones are small and grow at the end of the twigs, female ones grow from the middle part. The cones are about 12 mm long and consist of 5-6 pairs of seed scales. They mature in the first year.
It flowers from May to April.
Occurrence
It requires quality, permeable and slightly acidic soil. Soil that is too dry causes premature needle drop and overall thinning.
Use
It is used as a solitary plant. Suitable for hedges. The wood is light, durable, soft, reddish-brown in colour and has insulating properties. It is used for building constructions and for the production of shingles.
It belongs to the cypress family.