Repotting guide

When & how to repot Utricularia longifolia (Utricularia longifolia)

Also called Long-leaved Bladderwort, Brazilian Bladderwort.

More about utricularia longifolia

About Utricularia longifolia

Utricularia longifolia · also called Long-leaved Bladderwort, Brazilian Bladderwort · houseplant

Utricularia longifolia is a large Brazilian bladderwort with strap-shaped leaves and showy lavender-pink, yellow-blotched flowers that resemble little orchids. An affixed-epiphytic carnivore, it traps tiny organisms in soil-borne bladders and grows happily as a robust, easygoing houseplant in wet peat, making it one of the most ornamental Utricularia for indoors.

Mature size: Leaves 8-25 cm long; flower scapes 20-40 cm tall.

Watch for — Drying out: The strap leaves wilt and traps die if the medium dries. Keep the pot permanently standing in pure water.

How to tell utricularia longifolia needs repotting

Repotting on a calendar is less reliable than reading the plant. For utricularia longifolia, 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 utricularia longifolia 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 utricularia longifolia

Every 12–18 months — sooner if roots show fast. Utricularia longifolia's growth habit — robust affixed-epiphytic carnivore forming clumps of broad, strap-shaped green leaves from a network of stolons and bladders; sends up branched scapes carrying several large, orchid-like lavender-pink flowers marked with yellow. — sets the pace. Utricularia longifolia is a large Brazilian bladderwort with strap-shaped leaves and showy lavender-pink, yellow-blotched flowers that resemble little orchids. An affixed-epiphytic carnivore, it traps tiny organisms in soil-borne bladders and grows happily as a robust, easygoing houseplant in wet peat, making it one of the most ornamental Utricularia for indoors.

What size pot to step utricularia longifolia up to

Step up one pot size — about 2–3 cm (an inch) wider. Utricularia longifolia 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 utricularia longifolia

Early spring, just as new growth restarts, is the ideal window for utricularia longifolia. 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 utricularia longifolia

Time it for spring. Repot utricularia longifolia 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 utricularia longifolia out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh wet peat-based 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 utricularia longifolia 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 utricularia longifolia

Utricularia longifolia wants wet peat-based carnivorous mix. A live or milled sphagnum mix, or 2:1 peat to perlite, kept constantly wet. This large species also grows well in pure long-fibre sphagnum. Use only nutrient-poor, acidic media and never enriched potting 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 utricularia longifolia — frequently asked questions

How often should you repot utricularia longifolia?

Every 12–18 months — sooner if roots show fast for utricularia longifolia. Repot utricularia longifolia 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 peat-based carnivorous mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does utricularia longifolia need?

When is the best time of year to repot utricularia longifolia?

Can you put utricularia longifolia straight into a much bigger pot?

No. Even a fast-growing utricularia longifolia 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 utricularia longifolia after repotting?

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