Fertilising guide
How to fertilise Downy Rock Jasmine (Androsace pubescens)— schedule & NPK
Also called Downy rock jasmine, Pubescent androsace.
More about downy rock jasmine
About Downy Rock Jasmine
Androsace pubescens · also called Downy rock jasmine, Pubescent androsace · flowering
Androsace pubescens is a tight cushion-forming alpine perennial native to rocky limestone ledges and screes in the Pyrenees and western Alps, typically at elevations above 2,000 m. It produces compact silvery-haired rosettes smothered in small white flowers with a yellow or pink eye in late spring, and demands exceptional drainage alongside cool conditions to perform well. Being one of the more demanding Androsace species, it is best grown in an alpine house or deep tufa crevice to exclude winter wet. Androsace is not listed by the ASPCA; treat as mildly toxic and keep out of reach of pets as a precaution.
Growth habit: Dense, cushion-forming evergreen perennial composed of minute hairy rosettes that slowly form a compact hummock.
What fertiliser downy rock jasmine actually wants — and why
Downy Rock Jasmine 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 downy rock jasmine: 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 downy rock jasmine, 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 downy rock jasmine:
A single very light feed of quarter-strength balanced liquid fertiliser in spring, or a thin grit top-dressing with a trace of slow-release fertiliser; avoid nitrogen-rich feeds. 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 downy rock jasmine 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 downy rock jasmine
Half strength is the safe default for downy rock jasmine — 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 downy rock jasmine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the downy rock jasmine watering schedule.
Signs you are over-feeding downy rock jasmine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for downy rock jasmine:
- 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 downy rock jasmine
- 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 downy rock jasmine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of downy rock jasmine 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 downy rock jasmine
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 downy rock jasmine — frequently asked questions
What fertiliser does downy rock jasmine 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. Downy Rock Jasmine 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 downy rock jasmine?
A single very light feed of quarter-strength balanced liquid fertiliser in spring, or a thin grit top-dressing with a trace of slow-release fertiliser; avoid nitrogen-rich feeds. A single very light feed of quarter-strength balanced liquid fertiliser in spring, or a thin grit top-dressing with a trace of slow-release fertiliser; avoid nitrogen-rich feeds. 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 downy rock jasmine?
Half strength is the safe default for downy rock jasmine — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding downy rock jasmine 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 downy rock jasmine 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 downy rock jasmine?
Flush the pot of downy rock jasmine 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
- Downy Rock Jasmine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water downy rock jasmine — 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 wild rose
- How to fertilise japanese rose
- How to fertilise sweetbriar rose
- All 10153 fertilising guides in the Growli library