Repotting guide

When & how to repot Alpine Butterwort (Pinguicula alpina)

Also called alpine butterwort, white-flowered butterwort.

More about alpine butterwort

About Alpine Butterwort

Pinguicula alpina · also called alpine butterwort, white-flowered butterwort · houseplant

Alpine butterwort is a cold-hardy temperate carnivore from European and Asian mountains, forming a flat rosette of greasy, sticky leaves that glue down small insects. It needs cool conditions, pure mineral-free water, a gritty calcareous mix, and a true winter dormancy as a resting hibernaculum. White spurred flowers appear in spring.

Mature size: Rosette typically 3-6 cm across; flower stalks rise to about 5-12 cm.

Watch for — Mineral damage from hard water: Tap-water salts harm the roots and brown the leaves; water only with rainwater, distilled or RO water.

How to tell alpine butterwort needs repotting

Repotting on a calendar is less reliable than reading the plant. For alpine butterwort, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 alpine butterwort

Every 2–3 years, into bone-dry mix. Alpine Butterwort's growth habit — low, flat-pressed evergreen-to-summer rosette of pale, buttery, incurved leaves; in winter it shrinks to a tight resting bud (hibernaculum) at soil level. — sets the pace. Alpine butterwort is a cold-hardy temperate carnivore from European and Asian mountains, forming a flat rosette of greasy, sticky leaves that glue down small insects. It needs cool conditions, pure mineral-free water, a gritty calcareous mix, and a true winter dormancy as a resting hibernaculum. White spurred flowers appear in spring.

What size pot to step alpine butterwort up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Alpine Butterwort stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 alpine butterwort

Spring or summer, while alpine butterwort is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting alpine butterwort

Repot dry. Do not water alpine butterwort for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty mineral, slightly alkaline carnivorous mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set alpine butterwort at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep alpine butterwort completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for alpine butterwort

Alpine Butterwort wants mineral, slightly alkaline carnivorous mix. Unlike most carnivores, this species likes some calcium: a gritty blend of sand, perlite, fine grit and a little peat, often with limestone or tufa. Avoid pure acidic peat and never use fertilised potting soil. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting alpine butterwort — frequently asked questions

How often should you repot alpine butterwort?

Every 2–3 years, into bone-dry mix for alpine butterwort. Repot alpine butterwort every 2–3 years into a snug pot of mineral, slightly alkaline carnivorous mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does alpine butterwort need?

When is the best time of year to repot alpine butterwort?

Should you water alpine butterwort after repotting?

No — not straight away. Repot alpine butterwort into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise alpine butterwort after repotting?

Not immediately. Wait about 3 weeks after repotting alpine butterwort. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.