Repotting guide

When & how to repot Rivieri Voodoo Lily (Amorphophallus rivieri)

Also called rivieri voodoo lily, umbrella arum.

More about rivieri voodoo lily

About Rivieri Voodoo Lily

Amorphophallus rivieri · also called rivieri voodoo lily, umbrella arum · tropical

The rivieri voodoo lily (a name long applied to konjac-type Amorphophallus) grows from a large dormant tuber that throws a single dramatic, foul-smelling flower, then a tall umbrella-like dissected leaf on a mottled snakeskin petiole. It demands a warm growing season, rich moist soil, and a dry winter rest while the tuber sleeps underground.

Mature size: Leaf reaches 0.8-1.5 m tall with a canopy spread of up to 1 m; the inflorescence can rise 0.6-1 m. Mature tubers commonly reach 15-25 cm across.

How to tell rivieri voodoo lily needs repotting

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

Flowering has tailed off year on year and the clump has become congested and overcrowded.
Lots of leaf and few flowers — a classic sign that rivieri voodoo lily bulbs or tubers need lifting and dividing.
Bulbs visibly bursting the pot or pushing each other to the surface.
It is the natural dormancy window (foliage yellowed and died back) — the only safe time to lift and split.

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 rivieri voodoo lily

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, rivieri voodoo lily is lifted and divided once the clump congests and flowering drops off. Tuberous geophyte: a solitary inflorescence emerges first from a dormant corm, followed (or in alternate years) by one large, deeply divided umbrella-shaped leaf on a tall speckled petiole. Dies back to the tuber each winter..

What size pot to step rivieri voodoo lily up to

Pot size matters less than depth and spacing here. When you replant rivieri voodoo lily, set the bulbs or tubers at the correct depth (a rough guide: two to three times their own height of soil over the top) and space them so they are not touching. A wide, shallow pot suits a clump better than a tall narrow one.

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 rivieri voodoo lily

The only safe window is dormancy: wait until the foliage has yellowed and died back naturally, lift and divide then, and replant before or at the start of the next growing season. Disturbing rivieri voodoo lily in full growth or flower sets it back badly.

Step-by-step: repotting rivieri voodoo lily

Wait for dormancy. Let rivieri voodoo lily foliage yellow and die back completely. Lifting while it is in growth wastes the energy it is storing for next year.
Lift carefully. Loosen the soil well away from the bulbs/tubers with a fork and ease the whole clump out without spearing them.
Separate the offsets. Gently pull the clump apart into individual bulbs or tubers. Keep only firm, healthy, blemish-free ones.
Replant at the right depth. Reset them in fresh rich, loose, free-draining loam high in organic matter at the correct depth and spacing — not touching — so each has room to bulk up.
Water in and rest. Water once to settle them, then keep on the dry side until growth resumes. Do not feed until leaves are actively growing.

Aftercare

After replanting rivieri voodoo lily, keep the soil barely moist — not wet — until shoots appear; bulbs and tubers rot in cold, saturated soil. Once leaves are growing strongly, resume normal watering. Hold off feeding until the plant is in active growth again.

The right soil mix for rivieri voodoo lily

Rivieri Voodoo Lily wants rich, loose, free-draining loam high in organic matter. A deep, fertile mix of loam, compost and grit holds moisture for the hungry leaf while letting excess drain away from the tuber. Sharp drainage in the dormant season is essential to prevent corm rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rivieri voodoo lily — frequently asked questions

How often should you repot rivieri voodoo lily?

Lift and divide every 3–4 years once clumps congest for rivieri voodoo lily. Rivieri Voodoo Lily is lifted and divided, not "repotted". Every 3–4 years, once the foliage has died back and it is dormant, lift the clump, separate the offsets, and replant at the correct depth in rich, loose, free-draining loam high in organic matter. Crowding, not pot size, is what reduces flowering over time.

What size pot does rivieri voodoo lily need?

When is the best time of year to repot rivieri voodoo lily?

Do you "repot" rivieri voodoo lily, or lift and divide it?

You lift and divide it. Rivieri Voodoo Lily grows from bulbs or tubers, so instead of repotting you wait for dormancy, lift the congested clump, separate the healthy offsets, and replant them at the right depth and spacing. Doing this every 3–4 years restores flowering.

Should you fertilise rivieri voodoo lily after repotting?

Hold off feeding rivieri voodoo lily until it is in active growth again. Fresh soil already carries enough nutrients to get it re-established, and feeding disturbed roots too soon does more harm than good.