Fertilising guide
How to fertilise Russian Arborvitae (Microbiota decussata)— schedule & NPK
Also called Russian Arborvitae, Siberian Carpet Cypress, Russian Cypress.
More about russian arborvitae
About Russian Arborvitae
Microbiota decussata · also called Russian Arborvitae, Siberian Carpet Cypress · flowering
Microbiota decussata is a low-growing, spreading conifer native to the Zhitkov Mountains of Siberia, making it one of the hardiest conifers in cultivation. It forms a graceful, prostrate mound of feathery, scale-like foliage that turns purplish-bronze in winter. Outstanding as a ground cover in cold-climate gardens, it thrives in part shade and is undemanding once established.
Growth habit: Prostrate, spreading evergreen groundcover conifer; branches arch gracefully outward, hugging the ground
What fertiliser russian arborvitae actually wants — and why
Russian Arborvitae is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for russian arborvitae: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed russian arborvitae, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For russian arborvitae:
Apply a slow-release balanced fertiliser lightly in spring. Russian Arborvitae is naturally adapted to low-fertility substrates and generally does not need heavy feeding. Over-fertilising produces lush, soft growth less resistant to cold. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when russian arborvitae is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for russian arborvitae
Half strength is the safe default for russian arborvitae — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water russian arborvitae first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the russian arborvitae watering schedule.
Signs you are over-feeding russian arborvitae
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for russian arborvitae:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding russian arborvitae
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full russian arborvitae care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of russian arborvitae with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for russian arborvitae
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising russian arborvitae — frequently asked questions
What fertiliser does russian arborvitae need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Russian Arborvitae is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed russian arborvitae?
Apply a slow-release balanced fertiliser lightly in spring. Russian Arborvitae is naturally adapted to low-fertility substrates and generally does not need heavy feeding. Over-fertilising produces lush, soft growth less resistant to cold. Apply a slow-release balanced fertiliser lightly in spring. Russian Arborvitae is naturally adapted to low-fertility substrates and generally does not need heavy feeding. Over-fertilising produces lush, soft growth less resistant to cold. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for russian arborvitae?
Half strength is the safe default for russian arborvitae — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding russian arborvitae look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding russian arborvitae year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of russian arborvitae?
Flush the pot of russian arborvitae with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Russian Arborvitae care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water russian arborvitae — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise chinese white pine
- How to fertilise red pine
- How to fertilise shore pine
- All 6887 fertilising guides in the Growli library