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Fertilising guide

How to fertilise Pyrenean Rock Jasmine (Androsace pyrenaica)— schedule & NPK

Also called Pyrenean Rock Jasmine, Pyrenean Androsace.

More about pyrenean rock jasmine

About Pyrenean Rock Jasmine

Androsace pyrenaica · also called Pyrenean Rock Jasmine, Pyrenean Androsace · flowering

Androsace pyrenaica is a rare, high-alpine cushion perennial endemic to the eastern and central Pyrenees, growing in rocky limestone and silicate crevices at elevations of 1,800–3,000 m. It forms dense tufts of tiny, hairy grey-green rosettes and produces solitary white flowers with a yellow eye in spring — more restrained and challenging to flower than related species. It demands sharply drained, preferably gritty soil in full sun, and is best given winter shelter in an alpine house or a trough covered with glass; it is less forgiving of wet conditions than most Androsace. The genus is not listed on the ASPCA database; classified as mildly-toxic out of caution.

Growth habit: Densely tufted, cushion-forming evergreen perennial with minute hairy grey-green rosettes arranged in tight mounds.

What fertiliser pyrenean rock jasmine actually wants — and why

Pyrenean 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 pyrenean 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 pyrenean 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 pyrenean rock jasmine:

Minimal fertilising; at most a very light application of dilute, low-nitrogen fertiliser in spring — this species is adapted to nutrient-poor mountain substrates. 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 pyrenean 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 pyrenean rock jasmine

Half strength is the safe default for pyrenean 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 pyrenean 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 pyrenean rock jasmine watering schedule.

Signs you are over-feeding pyrenean rock jasmine

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for pyrenean rock jasmine:

Signs you are under-feeding pyrenean rock jasmine

If the symptoms point at watering, light or roots rather than nutrition, the full pyrenean rock jasmine care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of pyrenean 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 pyrenean 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 pyrenean rock jasmine — frequently asked questions

What fertiliser does pyrenean 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. Pyrenean 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 pyrenean rock jasmine?

Minimal fertilising; at most a very light application of dilute, low-nitrogen fertiliser in spring — this species is adapted to nutrient-poor mountain substrates. Minimal fertilising; at most a very light application of dilute, low-nitrogen fertiliser in spring — this species is adapted to nutrient-poor mountain substrates. 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 pyrenean rock jasmine?

Half strength is the safe default for pyrenean 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 pyrenean 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 pyrenean 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 pyrenean rock jasmine?

Flush the pot of pyrenean 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.

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