Soil & potting mix
Best soil for Chinese Arborvitae (Thuja orientalis)
Also called Chinese Arborvitae, Oriental Arborvitae, Biota, Oriental Thuja.
More about chinese arborvitae
About Chinese Arborvitae
Thuja orientalis · also called Chinese Arborvitae, Oriental Arborvitae · flowering
Chinese Arborvitae (now often reclassified as Platycladus orientalis) is a versatile, drought-tolerant evergreen conifer from northeastern China and Korea. Its distinctive vertically held, fan-like foliage sprays set it apart from other arborvitaes. Highly adaptable to heat, drought, and alkaline soils, it is widely used in warm-climate hedging, topiary, and specimen planting.
Preferred mix: Well-drained, moderately fertile loam, sandy loam, or clay; tolerates alkaline pH
Watch for — Root Rot (Phytophthora): Phytophthora root and crown rot causes yellowing, wilting, and eventual plant death in poorly drained, wet soils. Ensure excellent drainage at planting; raise beds if necessary. No effective chemical cure once established — prevention through siting is essential.
Why chinese arborvitae needs this mix
Chinese Arborvitae is a Mediterranean dry-hillside plant — it wants a lean, sharply drained, slightly alkaline mix, and rots fast in rich, water-holding soil.
- Chinese Arborvitae evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
- A lean, low-nutrient mix keeps growth firm and aromatic; a rich one gives soft, sappy, flavourless growth that flops and rots.
- It tolerates and often prefers a slightly alkaline soil, the opposite of most houseplants.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons chinese arborvitae struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Rich, moisture-holding compost is the classic killer of chinese arborvitae — especially over a cold, wet winter, when the base of the plant simply rots.
- A peaty, acidic potting mix is doubly wrong: too wet and the wrong pH direction.
- No grit means the rootball stays damp for days, which a dry-climate root system never copes with.
Growing chinese arborvitae in ordinary rich, moisture-retentive compost. Lean it out with at least a third grit, and never let it sit wet over winter.
pH — does it matter for chinese arborvitae?
Chinese Arborvitae likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
Bagged "herb" or "Mediterranean" mixes are usually fine for chinese arborvitae, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Drainage and the pot
Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
A gritty mix barely breaks down, so chinese arborvitae needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. When the time comes, our repotting guide for chinese arborvitae covers the timing and technique step by step.
Chinese Arborvitae soil — frequently asked questions
What is the best soil mix for chinese arborvitae?
2 parts standard peat-free compost or loam : 1 part coarse horticultural grit : 1 part perlite or coarse sand. Chinese Arborvitae evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
Can I use normal potting soil for chinese arborvitae?
Rich, moisture-holding compost is the classic killer of chinese arborvitae — especially over a cold, wet winter, when the base of the plant simply rots. Bagged "herb" or "Mediterranean" mixes are usually fine for chinese arborvitae, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Does chinese arborvitae need a special pH?
Chinese Arborvitae likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
Should I buy a bagged mix or make my own for chinese arborvitae?
Bagged "herb" or "Mediterranean" mixes are usually fine for chinese arborvitae, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
How often should I refresh the soil for chinese arborvitae?
A gritty mix barely breaks down, so chinese arborvitae needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
Keep reading
- Chinese Arborvitae care — the full brief (light, water, humidity, problems, pet safety)
- How often to water chinese arborvitae — the schedule the mix feeds into
- Repotting chinese arborvitae — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
- Should I water my plant? The simple check first
- Best soil for hydrocharis morsus-ranae
- Best soil for stratiotes aloides
- Best soil for ranunculus aquatilis
- All 6887 soil and potting-mix guides in the Growli library