Repotting guide

When & how to repot Pseudodracontium lacourii (Pseudodracontium lacourii)

Also called Lacoeur's pseudodracontium, African giant arum.

More about pseudodracontium lacourii

About Pseudodracontium lacourii

Pseudodracontium lacourii · also called Lacoeur's pseudodracontium, African giant arum · tropical

Pseudodracontium lacourii is a tropical Southeast Asian tuberous aroid, closely allied to Amorphophallus, grown for its single tall, dragon-spotted stalk and large, finely divided umbrella-like leaf. It produces a slim greenish hooded inflorescence, then rests as a dormant tuber. Give it warmth, humidity, dappled shade and rich, free-draining soil with a dry rest period.

Mature size: Commonly 60-120 cm tall in leaf depending on tuber size; the solitary leaf can spread broadly. The tuber enlarges and offsets over the years.

How to tell pseudodracontium lacourii needs repotting

Repotting on a calendar is less reliable than reading the plant. For pseudodracontium lacourii, 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 pseudodracontium lacourii 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 pseudodracontium lacourii

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, pseudodracontium lacourii is lifted and divided once the clump congests and flowering drops off. Deciduous tropical tuberous geophyte producing one tall, mottled pseudostem topped by a single large, finely dissected umbrella leaf, then an occasional slim inflorescence; dies back to a tuber each rest period..

What size pot to step pseudodracontium lacourii up to

Pot size matters less than depth and spacing here. When you replant pseudodracontium lacourii, 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 pseudodracontium lacourii

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 pseudodracontium lacourii in full growth or flower sets it back badly.

Step-by-step: repotting pseudodracontium lacourii

Wait for dormancy. Let pseudodracontium lacourii 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, free-draining humus mix 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 pseudodracontium lacourii, 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 pseudodracontium lacourii

Pseudodracontium lacourii wants rich, free-draining humus mix. A fertile, organic, sharply drained medium — loam with leaf mould, compost and grit or perlite — suits the tuber. Drainage prevents rot while the organic matter feeds vigorous seasonal growth. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pseudodracontium lacourii — frequently asked questions

How often should you repot pseudodracontium lacourii?

Lift and divide every 3–4 years once clumps congest for pseudodracontium lacourii. Pseudodracontium lacourii 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, free-draining humus mix. Crowding, not pot size, is what reduces flowering over time.

What size pot does pseudodracontium lacourii need?

When is the best time of year to repot pseudodracontium lacourii?

Do you "repot" pseudodracontium lacourii, or lift and divide it?

You lift and divide it. Pseudodracontium lacourii 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 pseudodracontium lacourii after repotting?

Hold off feeding pseudodracontium lacourii 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.