Repotting guide

When & how to repot Typhonodorum lindleyanum (Typhonodorum lindleyanum)

Also called Madagascar water arum, water banana.

More about typhonodorum lindleyanum

About Typhonodorum lindleyanum

Typhonodorum lindleyanum · also called Madagascar water arum, water banana · tropical

A giant aquatic aroid from Madagascar and East Africa, resembling a banana plant growing in water. It forms a thick trunk-like stem topped with huge arrow-shaped leaves and lives with its base permanently submerged in shallow water or boggy mud, making it a dramatic specimen for large heated ponds and conservatory pools.

Mature size: Can reach 2-4 m tall with leaves over 1 m long in ideal warm, wet conditions.

How to tell typhonodorum lindleyanum needs repotting

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

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and typhonodorum lindleyanum wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full repot.

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 typhonodorum lindleyanum

Every 2–3 years; top-dress in the in-between years. Typhonodorum lindleyanum's growth habit — large, clumping, semi-aquatic tropical aroid forming a stout pseudo-trunk topped with a crown of huge sagittate leaves; suckers from the base. — sets the pace. A giant aquatic aroid from Madagascar and East Africa, resembling a banana plant growing in water. It forms a thick trunk-like stem topped with huge arrow-shaped leaves and lives with its base permanently submerged in shallow water or boggy mud, making it a dramatic specimen for large heated ponds and conservatory pools.

What size pot to step typhonodorum lindleyanum up to

Move up exactly one pot size. A heavy typhonodorum lindleyanum dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

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 typhonodorum lindleyanum

Early spring, just as new growth restarts, is the ideal window for typhonodorum lindleyanum. 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 typhonodorum lindleyanum

Consider top-dressing first. If typhonodorum lindleyanum is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh heavy, fertile aquatic loam beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave typhonodorum lindleyanum in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave typhonodorum lindleyanum in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for typhonodorum lindleyanum

Typhonodorum lindleyanum wants heavy, fertile aquatic loam. Plant in dense, nutrient-rich loam or aquatic compost weighted down, with the surface gravelled to stop it clouding the water. Light, free-draining mixes are unsuitable for this bog/water plant. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting typhonodorum lindleyanum — frequently asked questions

How often should you repot typhonodorum lindleyanum?

Every 2–3 years; top-dress in the in-between years for typhonodorum lindleyanum. Fully repot typhonodorum lindleyanum only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with heavy, fertile aquatic loam. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does typhonodorum lindleyanum need?

When is the best time of year to repot typhonodorum lindleyanum?

Should you top-dress or fully repot typhonodorum lindleyanum?

For a big, heavy typhonodorum lindleyanum, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise typhonodorum lindleyanum after repotting?

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