Repotting guide

When & how to repot Corkscrew Plant (Genlisea violacea)

Also called corkscrew plant, lobster pot plant.

More about corkscrew plant

About Corkscrew Plant

Genlisea violacea · also called corkscrew plant, lobster pot plant · houseplant

The corkscrew plant is an unusual Brazilian carnivore that traps tiny soil organisms underground with corkscrew-shaped 'lobster-pot' leaves, while showing only small green rosettes and violet flowers above the surface. It thrives boggy and warm, in waterlogged peat-sand, under bright light, watered only with mineral-free water. A curiosity for bog-terrarium growers.

Mature size: Surface rosettes only 2-5 cm across, spreading into a low mat; violet flower stalks rise to about 10-25 cm.

Watch for — Drying out: It has no true roots and dies quickly if the medium dries. Keep the pot standing in water permanently; never let the bog go dry.

How to tell corkscrew plant needs repotting

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

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new corkscrew plant leaves are noticeably smaller than older ones despite good light.

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 corkscrew plant

Every 12–18 months — sooner if roots show fast. Corkscrew Plant's growth habit — rootless rhizoid carnivore: small grass-like green rosettes sit on the surface while modified subterranean corkscrew (lobster-pot) leaves trap microfauna below; spreads slowly into a low clump. — sets the pace. The corkscrew plant is an unusual Brazilian carnivore that traps tiny soil organisms underground with corkscrew-shaped 'lobster-pot' leaves, while showing only small green rosettes and violet flowers above the surface. It thrives boggy and warm, in waterlogged peat-sand, under bright light, watered only with mineral-free water. A curiosity for bog-terrarium growers.

What size pot to step corkscrew plant up to

Step up one pot size — about 2–3 cm (an inch) wider. Corkscrew Plant grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 corkscrew plant

Early spring, just as new growth restarts, is the ideal window for corkscrew plant. 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 corkscrew plant

Time it for spring. Repot corkscrew plant in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip corkscrew plant out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh wet, nutrient-free carnivorous mix in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water corkscrew plant once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for corkscrew plant

Corkscrew Plant wants wet, nutrient-free carnivorous mix. Live or milled sphagnum, or a peat-and-sand blend kept constantly waterlogged. Some growers grow it in pure wet sand over peat. Never any fertiliser or ordinary compost. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting corkscrew plant — frequently asked questions

How often should you repot corkscrew plant?

Every 12–18 months — sooner if roots show fast for corkscrew plant. Repot corkscrew plant roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh wet, nutrient-free carnivorous mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does corkscrew plant need?

When is the best time of year to repot corkscrew plant?

Can you put corkscrew plant straight into a much bigger pot?

No. Even a fast-growing corkscrew plant should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise corkscrew plant after repotting?

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