Repotting guide

When & how to repot Pyrenean Rock Jasmine (Androsace pyrenaica)

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.

Mature size: Up to 10 cm tall and 5–10 cm across.

Watch for — Aphid infestation under glass: Root and shoot aphids can colonise cushions in the warm, sheltered conditions of an alpine house; inspect roots at repotting and treat with an appropriate insecticide, ensuring the cushion surface stays dry during treatment.

How to tell pyrenean rock jasmine needs repotting

Repotting on a calendar is less reliable than reading the plant. For pyrenean rock jasmine, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for pyrenean rock jasmine) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot pyrenean rock jasmine

Only every 2–4 years, when genuinely crowded. Pyrenean Rock Jasmine is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Densely tufted, cushion-forming evergreen perennial with minute hairy grey-green rosettes arranged in tight mounds..

What size pot to step pyrenean rock jasmine up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Pyrenean Rock Jasmine positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping pyrenean rock jasmine into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot pyrenean rock jasmine

Early spring, just as new growth restarts, is the ideal window for pyrenean rock jasmine. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting pyrenean rock jasmine

Confirm it actually needs it. Slide pyrenean rock jasmine out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip pyrenean rock jasmine out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh loam, sand, and chalk or grit mix; well-drained, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water pyrenean rock jasmine again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for pyrenean rock jasmine

Pyrenean Rock Jasmine wants loam, sand, and chalk or grit mix; well-drained. Accepts a range of pH including slightly alkaline; the key requirement is impeccable drainage — a mix of loam, coarse grit, and crushed limestone (for calcareous-origin plants) or granite chips works well. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pyrenean rock jasmine — frequently asked questions

How often should you repot pyrenean rock jasmine?

Only every 2–4 years, when genuinely crowded for pyrenean rock jasmine. Only repot pyrenean rock jasmine every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using loam, sand, and chalk or grit mix; well-drained. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does pyrenean rock jasmine need?

When is the best time of year to repot pyrenean rock jasmine?

Does pyrenean rock jasmine like to be root-bound?

Yes — pyrenean rock jasmine genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise pyrenean rock jasmine after repotting?

Not immediately. Wait about 4 weeks after repotting pyrenean rock jasmine. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.