Repotting guide

When & how to repot False Aralia (Plerandra elegantissima)

Also called False aralia, Spider aralia, Threadleaf aralia, Finger aralia.

More about false aralia

About False Aralia

Plerandra elegantissima · also called False aralia, Spider aralia · houseplant

False aralia is a fine-textured foliage houseplant from the South Pacific, prized for its slender, saw-toothed, coppery-to-near-black juvenile leaflets fanned out like fingers. Its defining care need is stability: it resents being moved, draughts, cold and sudden swings in light or watering, and responds to stress by dropping leaves.

Mature size: Typically 1.2-1.8 m tall as a houseplant with periodic pruning; in frost-free climates outdoors it can reach 6-8 m as a small tree.

Watch for — Sudden leaf drop: The single most common complaint. A change of location, a cold draught, dry air or letting the rootball dry out all trigger shedding of the fine leaflets. Settle it in one stable spot with steady warmth, light and watering and avoid moving it.

How to tell false aralia needs repotting

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

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new false aralia leaves are noticeably smaller than older ones despite good light.

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 false aralia

Every 12–18 months — sooner if roots show fast. False Aralia's growth habit — an upright, open, slowly branching evergreen shrub indoors. juvenile plants show the prized lacy look — narrow, jagged, coppery-bronze leaflets (7-10 per leaf) that mature to very dark grey-green; with age and size the foliage shifts to broader, coarser adult leaflets, and both types can appear on the same plant. — sets the pace. False aralia is a fine-textured foliage houseplant from the South Pacific, prized for its slender, saw-toothed, coppery-to-near-black juvenile leaflets fanned out like fingers. Its defining care need is stability: it resents being moved, draughts, cold and sudden swings in light or watering, and responds to stress by dropping leaves.

What size pot to step false aralia up to

Step up one pot size — about 2–3 cm (an inch) wider. False Aralia grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 false aralia

Early spring, just as new growth restarts, is the ideal window for false aralia. 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 false aralia

Time it for spring. Repot false aralia in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip false aralia out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh rich, free-draining houseplant mix in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water false aralia once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for false aralia

False Aralia wants rich, free-draining houseplant mix. Use a fertile, peat-free potting compost lightened with perlite and a little fine bark so it holds moisture yet drains freely. The plant prefers a slightly acidic to neutral mix; always pot into a container with drainage holes to avoid the standing water that causes root 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 false aralia — frequently asked questions

How often should you repot false aralia?

Every 12–18 months — sooner if roots show fast for false aralia. Repot false aralia roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh rich, free-draining houseplant mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does false aralia need?

When is the best time of year to repot false aralia?

Can you put false aralia straight into a much bigger pot?

No. Even a fast-growing false aralia should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise false aralia after repotting?

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