Fertilising guide
How to fertilise Chinese Premna (Premna microphylla)— schedule & NPK
Also called Chinese Premna, Smallleaf Premna.
More about chinese premna
About Chinese Premna
Premna microphylla · also called Chinese Premna, Smallleaf Premna · flowering
Chinese premna is a subtropical broadleaf shrub used in bonsai for its tiny glossy leaves, rugged bark and fine ramification. It grows fast in warmth, backbuds freely and reduces well, but it is frost-tender and needs protection or indoor growing in cool climates. Bright light, steady moisture and warmth keep it dense and vigorous.
Growth habit: Vigorous subtropical broadleaf shrub with very small leaves and rugged, characterful bark; backbuds readily and ramifies finely, making it excellent for informal upright and shohin-scale bonsai.
What fertiliser chinese premna actually wants — and why
Chinese Premna 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 chinese premna: 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 chinese premna, 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 chinese premna:
Feed every two weeks during active growth with a balanced bonsai fertiliser; its fast growth in warmth rewards steady feeding. Reduce feeding when growth slows in cooler months. 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 chinese premna 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 chinese premna
Half strength is the safe default for chinese premna — 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 chinese premna first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the chinese premna watering schedule.
Signs you are over-feeding chinese premna
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for chinese premna:
- 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 chinese premna
- 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 chinese premna care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of chinese premna 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 chinese premna
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 chinese premna — frequently asked questions
What fertiliser does chinese premna 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. Chinese Premna 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 chinese premna?
Feed every two weeks during active growth with a balanced bonsai fertiliser; its fast growth in warmth rewards steady feeding. Reduce feeding when growth slows in cooler months. Feed every two weeks during active growth with a balanced bonsai fertiliser; its fast growth in warmth rewards steady feeding. Reduce feeding when growth slows in cooler months. 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 chinese premna?
Half strength is the safe default for chinese premna — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding chinese premna 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 chinese premna 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 chinese premna?
Flush the pot of chinese premna 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
- Chinese Premna care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water chinese premna — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 5561 fertilising guides in the Growli library