Repotting guide

When & how to repot Fanged Pitcher Plant (Nepenthes bicalcarata)

Also called Fanged Pitcher Plant, Two-Fanged Pitcher Plant, Two-Spurred Nepenthes.

More about fanged pitcher plant

About Fanged Pitcher Plant

Nepenthes bicalcarata · also called Fanged Pitcher Plant, Two-Fanged Pitcher Plant · tropical

Nepenthes bicalcarata is a large lowland carnivorous pitcher plant endemic to the peat swamp forests and kerangas heath forests of Borneo, growing below 300 m altitude. Its common name derives from two prominent hollow spines beneath the pitcher lid — among the largest nectaries in the plant kingdom — which attract carpenter ants (Camponotus schmitzi) that nest in the plant's hollow tendrils and assist its prey capture. As a lowland species it demands consistently high temperatures and very high humidity with no significant temperature drop at night. Nepenthes are not listed as toxic by the ASPCA and are considered mildly-toxic as a general precaution for mild digestive upset if ingested by pets.

Mature size: Vine can reach 3–6 m in ideal conditions; lower pitchers 15–25 cm tall, upper pitchers somewhat smaller.

Watch for — Stunted growth from being root-bound: N. bicalcarata is a large, fast-growing vine that becomes root-bound rapidly; up-pot into a significantly larger container each year and use deep baskets to accommodate the root system.

How to tell fanged pitcher plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For fanged pitcher 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 fanged pitcher 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 fanged pitcher plant

Every 12–18 months — sooner if roots show fast. Fanged Pitcher Plant's growth habit — vigorous climbing vine that can ramble extensively in warm conditions; in cultivation typically grows as a large hanging basket or terrarium specimen. — sets the pace. Nepenthes bicalcarata is a large lowland carnivorous pitcher plant endemic to the peat swamp forests and kerangas heath forests of Borneo, growing below 300 m altitude. Its common name derives from two prominent hollow spines beneath the pitcher lid — among the largest nectaries in the plant kingdom — which attract carpenter ants (Camponotus schmitzi) that nest in the plant's hollow tendrils and assist its prey capture. As a lowland species it demands consistently high temperatures and very high humidity with no significant temperature drop at night. Nepenthes are not listed as toxic by the ASPCA and are considered mildly-toxic as a general precaution for mild digestive upset if ingested by pets.

What size pot to step fanged pitcher plant up to

Step up one pot size — about 2–3 cm (an inch) wider. Fanged Pitcher 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 fanged pitcher plant

Early spring, just as new growth restarts, is the ideal window for fanged pitcher 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 fanged pitcher plant

Time it for spring. Repot fanged pitcher 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 fanged pitcher plant out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh low-nutrient, free-draining 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 fanged pitcher 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 fanged pitcher plant

Fanged Pitcher Plant wants low-nutrient, free-draining carnivorous mix. A blend of peat, perlite, and sphagnum moss works well; alternatively use pure long-fibre sphagnum. Never use garden compost or standard potting mix. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting fanged pitcher plant — frequently asked questions

How often should you repot fanged pitcher plant?

Every 12–18 months — sooner if roots show fast for fanged pitcher plant. Repot fanged pitcher 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 low-nutrient, free-draining carnivorous mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does fanged pitcher plant need?

When is the best time of year to repot fanged pitcher plant?

Can you put fanged pitcher plant straight into a much bigger pot?

No. Even a fast-growing fanged pitcher 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 fanged pitcher plant after repotting?

Not immediately. Wait about 4 weeks after repotting fanged pitcher 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.