Mature size & growth rate

How big does Cylindrical Rock Jasmine (Androsace cylindrica) get?

Also called Cylindrical Rock Jasmine, Cylindrical Androsace.

More about cylindrical rock jasmine

About Cylindrical Rock Jasmine

Androsace cylindrica · also called Cylindrical Rock Jasmine, Cylindrical Androsace · flowering

Cylindrical Rock Jasmine is a rare, specialist alpine perennial endemic to the Pyrenees, forming extraordinarily tight, elongated cylindrical rosettes that build into dense domed cushions. White flowers with a yellow eye appear in spring. One of the most challenging Androsace species in cultivation, it is grown almost exclusively by specialist alpine enthusiasts in an alpine house or tufa garden.

Mature size: 2–5 cm tall, spreading 5–10 cm wide over many years

Watch for — Failure on non-calcareous substrates: This strict endemic calcicole declines rapidly on acidic or lime-free growing media, showing yellowing, poor growth, and failure to flower. Alkaline, lime-rich limestone grit or genuine tufa is the non-negotiable substrate requirement.

Indoor size vs how big it gets in the wild

Cylindrical Rock Jasmine is a naturally small plant — it stays shelf- and desk-sized for its whole life, so it never becomes a space problem. Indoors and in a pot, expect 2–5 cm tall, spreading 5–10 cm wide over many years. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

It grows mostly by adding leaves, offsets or a slightly wider rosette rather than gaining height — the footprint barely changes year to year.

Growth rate and years to mature

Cylindrical Rock Jasmine is a slow grower. Realistically, expect many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Its feeding profile backs this up: none. the species is adapted to near-sterile limestone cliff substrate. fertiliser of any kind promotes abnormal soft growth incompatible with the tight cylindrical rosette form and increases susceptibility to fungal disease. the lime-rich grit provides all required calcium and trace minerals.

Want this turned into the right next pot at the right moment? The pot size calculator and the cylindrical rock jasmine repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast cylindrical rock jasmine grows.

How to keep cylindrical rock jasmine smaller

Good news — cylindrical rock jasmine barely needs managing. If you do want to keep it tidy:

You rarely need to do anything: cylindrical rock jasmine is so slow that it can sit in the same small pot for years.
Keeping it slightly pot-bound and easing back on feed naturally caps the size.
Pinch or remove the oldest, tiredest leaves so energy goes into a compact, fresh-looking plant.

How to grow cylindrical rock jasmine bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for cylindrical rock jasmine the accelerators are:

It is already in good light; consistent warmth and a balanced feed in spring and summer are the only levers.
A small step up in pot size every couple of years gives the roots a little more room without triggering a size jump.
Feed lightly through the growing season; this plant simply will not race however hard you push it.

Light is almost always the ceiling. The cylindrical rock jasmine light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When cylindrical rock jasmine outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for cylindrical rock jasmine:

Roots circling the bottom or pushing out of the drainage hole — it wants a pot one size up, not a bigger room.
Offsets crowding the surface so the original plant looks squashed.
Honestly, cylindrical rock jasmine rarely outgrows a room — outgrowing its pot is the only realistic limit.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the cylindrical rock jasmine repotting guide. If you want more of this plant instead of a bigger one, the cylindrical rock jasmine propagation guide turns prunings into new plants.

Cylindrical Rock Jasmine size — frequently asked questions

How big does cylindrical rock jasmine get?

Cylindrical Rock Jasmine reaches 2–5 cm tall, spreading 5–10 cm wide over many years when grown indoors. It grows mostly by adding leaves, offsets or a slightly wider rosette rather than gaining height — the footprint barely changes year to year.

Is cylindrical rock jasmine slow or fast growing?

Cylindrical Rock Jasmine is a slow grower. Expect many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Cylindrical Rock Jasmine is a naturally small plant — it stays shelf- and desk-sized for its whole life, so it never becomes a space problem.

How long does cylindrical rock jasmine take to reach full size?

Roughly many years — it gains very little each season, so it can hold the same shelf-sized footprint for 5-10+ years. Light, pot size and feeding move that timeline more than anything else.

How do I keep cylindrical rock jasmine smaller?

You rarely need to do anything: cylindrical rock jasmine is so slow that it can sit in the same small pot for years. Keeping it slightly pot-bound and easing back on feed naturally caps the size. Pinch or remove the oldest, tiredest leaves so energy goes into a compact, fresh-looking plant.

How can I make cylindrical rock jasmine grow bigger or faster?

It is already in good light; consistent warmth and a balanced feed in spring and summer are the only levers. A small step up in pot size every couple of years gives the roots a little more room without triggering a size jump. Feed lightly through the growing season; this plant simply will not race however hard you push it.