Repotting guide

When & how to repot Rodent Tuber (Typhonium flagelliforme)

Also called Rodent Tuber, Keladi Tikus, Whip Typhonium.

More about rodent tuber

About Rodent Tuber

Typhonium flagelliforme · also called Rodent Tuber, Keladi Tikus · tropical

Rodent Tuber is a small Southeast Asian aroid widely used in traditional medicine across Malaysia and Indonesia. It grows to around 40 cm with simple arrow-shaped leaves and small purple-speckled spathes bearing a distinctive whip-like spadix appendage. It favours moist, shaded, disturbed habitats near streams. Grow in partial shade with consistently moist, well-drained soil.

Mature size: 20–40 cm tall; spread 20–30 cm

Watch for — Tuber rot from poor drainage: Although this species prefers moist conditions, sitting in waterlogged soil causes rapid tuber rot. Ensure the growing mix is moisture-retentive but free-draining. Use containers with adequate drainage holes and never let pots sit in standing water for prolonged periods.

How to tell rodent tuber needs repotting

Repotting on a calendar is less reliable than reading the plant. For rodent tuber, 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 rodent tuber 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 rodent tuber

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, rodent tuber is lifted and divided once the clump congests and flowering drops off. Small tuberous geophyte; produces arrow-shaped leaves on long petioles and spathes with a whip-like appendage on the spadix; seasonally dormant.

What size pot to step rodent tuber up to

Pot size matters less than depth and spacing here. When you replant rodent tuber, 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 rodent tuber

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 rodent tuber in full growth or flower sets it back badly.

Step-by-step: repotting rodent tuber

Wait for dormancy. Let rodent tuber 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 humus-rich, moisture-retentive but well-draining soil 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 rodent tuber, 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 rodent tuber

Rodent Tuber wants humus-rich, moisture-retentive but well-draining soil. A mix of compost, loam, and a small amount of perlite (3:2:1) maintains adequate moisture while preventing waterlogging. Slightly acidic to neutral pH (5.5–7.0). Replicating the rich alluvial soils of its native riparian habitat with organic-matter-rich compost is beneficial. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rodent tuber — frequently asked questions

How often should you repot rodent tuber?

Lift and divide every 3–4 years once clumps congest for rodent tuber. Rodent Tuber 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 humus-rich, moisture-retentive but well-draining soil. Crowding, not pot size, is what reduces flowering over time.

What size pot does rodent tuber need?

When is the best time of year to repot rodent tuber?

Do you "repot" rodent tuber, or lift and divide it?

You lift and divide it. Rodent Tuber 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 rodent tuber after repotting?

Hold off feeding rodent tuber 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.