Repotting guide

When & how to repot Pink Arisaema (Arisaema candidissimum)

Also called pink cobra lily, white-spathed arisaema.

More about pink arisaema

About Pink Arisaema

Arisaema candidissimum · also called pink cobra lily, white-spathed arisaema · flowering

Arisaema candidissimum is a charming Chinese woodland perennial with one of the prettiest, least sinister flowers in the genus — a softly pink-and-white striped, sweetly scented spathe. It emerges late, after which a single large three-parted leaf unfurls. Grown from a corm, it wants cool, moist, humus-rich shade and a dry winter rest.

Mature size: Typically 30-45 cm tall with a leaf spread up to about 40 cm; forms a slowly increasing clump as the corm offsets.

Watch for — Very late emergence: It is among the latest Arisaema to appear, often not breaking ground until late spring or early summer. Mark its spot to avoid digging into the dormant corm by mistake.

How to tell pink arisaema needs repotting

Repotting on a calendar is less reliable than reading the plant. For pink arisaema, 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 pink arisaema 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 pink arisaema

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, pink arisaema is lifted and divided once the clump congests and flowering drops off. Cormous herbaceous perennial. Notably late to emerge, it produces a scented pink-and-white spathe first, followed by a single large, three-lobed (trifoliate) leaf. Forms a red berry cluster if pollinated, then dies back to the corm; can shift sex between seasons..

What size pot to step pink arisaema up to

Pot size matters less than depth and spacing here. When you replant pink arisaema, 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 pink arisaema

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 pink arisaema in full growth or flower sets it back badly.

Step-by-step: repotting pink arisaema

Wait for dormancy. Let pink arisaema 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 woodland soil with abundant leaf mould, neutral to slightly acidic 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 pink arisaema, 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 pink arisaema

Pink Arisaema wants rich, free-draining woodland soil with abundant leaf mould, neutral to slightly acidic. A loose, humus-rich, gritty mix retains growing-season moisture yet drains freely, protecting the corm from winter-wet rot. Incorporate leaf mould and grit to mimic its montane woodland origins. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pink arisaema — frequently asked questions

How often should you repot pink arisaema?

Lift and divide every 3–4 years once clumps congest for pink arisaema. Pink Arisaema 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 woodland soil with abundant leaf mould, neutral to slightly acidic. Crowding, not pot size, is what reduces flowering over time.

What size pot does pink arisaema need?

When is the best time of year to repot pink arisaema?

Do you "repot" pink arisaema, or lift and divide it?

You lift and divide it. Pink Arisaema 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 pink arisaema after repotting?

Hold off feeding pink arisaema 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.