Gadenin日本語Get the appThe commonest mistake with this plant
A polyscias arrives home, drops most of its leaves within a fortnight, and its owner reaches for a bigger pot. It is an understandable reaction and it is almost always the wrong one. Leaf drop after a change of room, light level or temperature is normal behavior for this plant, the roots are fine, and repotting adds root damage to a plant that is already living on reserves.
The correct response to post-move leaf drop is to leave the plant alone: same position, no feed, slightly less water than usual, and patience for six to ten weeks. Repot only once the plant is growing again. A plant that is pushing new shoots can afford the disturbance; a bare-stemmed one cannot.
If you have already repotted a sulking plant, do not try to correct it by putting it back. Leave it where it is, keep the compost only just moist, keep it warm, and wait. Repeated disturbance is what kills these plants, not any single mistake.
When it genuinely needs a bigger pot
An aralia is happy slightly snug and does not need frequent repotting. Every two to three years is a normal rhythm for a young plant, and a large established specimen can go longer than that. Rather than working to a calendar, look for actual evidence that the roots have run out of room.
| Sign | What it means | Action |
|---|---|---|
| Roots emerging from the drainage holes | Root ball has filled the pot | Repot in the warm months |
| Water runs straight through in seconds | Almost all root, very little compost left | Repot one size up |
| Pot dries out within a day or two | Root mass outstripping the volume | Repot, or water more often until the season suits |
| Plant lifts out as a solid root-shaped block | Pot bound | Repot, tease the outer roots gently |
| Growth has stalled but roots look normal | Not a pot problem | Check light, warmth and feeding instead |
| Compost stays wet for a week, sour smell | Root rot or too large a pot | Investigate the roots, do not simply pot on |
Pot, mix and timing
Go up one size only, roughly one to two inches (2.5 to 5 cm) more in diameter. This plant hates sitting in cold wet compost more than almost anything else, and a big pot around a small root ball holds a reservoir of water the roots cannot use. That is exactly the situation that rots them. A pot that is only slightly larger dries at a rate the plant can keep up with.
Drainage holes are compulsory. If you like a decorative container without holes, keep the plant in a plastic nursery pot and drop that inside the cachepot, then tip out anything that collects in the bottom after each watering. Repot in the warm growing months so the roots re-establish quickly, and never in the cold part of the year when a damaged root system sits wet for weeks.
| Component | Share of mix | Why |
|---|---|---|
| Good quality peat-free potting mix | About half | Holds enough moisture and nutrients |
| Perlite or coarse grit | About a quarter | Keeps air in the mix and drains fast |
| Fine bark or coco chips | About a quarter | Structure that lasts, stops compaction |
| Slow-release feed | Optional, low rate | Only for a plant already in strong growth |
Do not put a layer of gravel in the bottom of the pot. It does not improve drainage; it raises the saturated zone up into the root ball. Use a free-draining mix throughout instead.
Doing it with minimal disturbance
The aim is to move the plant into more room while breaking as few roots as possible. Work quickly, have everything ready before the plant comes out of its pot, and keep the root ball out of the air for as little time as you can.
- Water the day before A moist root ball holds together and slides out cleanly. A dry one crumbles and tears fine roots as it falls apart. This one step prevents most repotting damage.
- Ease it out, do not pull the stem Run a knife around the inside of the pot, tip the plant sideways supporting the base of the stems with one hand, and let the root ball slide out. Never lift the plant by its trunk with the pot hanging off it.
- Leave the root ball intact Tease out only the roots circling the outside, and only lightly. Do not wash the compost off, do not comb the root ball apart, and do not prune healthy roots. Aralias sulk in proportion to how much you disturb them.
- Cut away only what is dead Healthy roots are firm and pale. Anything brown, soft or sliding out of its skin is dead and should be cut back to firm tissue with clean snips. If a lot is dead, take the opportunity to check the drainage and the temperature of the position afterwards.
- Set it at the same depth Add mix under the root ball so the top of it sits about half an inch (1 cm) below the pot rim, then fill around the sides and firm gently. Burying the stem deeper than it grew before invites rot at the base.
- Water once, then hold back Water thoroughly to settle the mix, let it drain completely, and then keep the compost only just moist until you see new growth. A disturbed root system cannot drink at its old rate, and this is the fortnight in which most repotted aralias are drowned.
The weeks afterwards
Expect a reaction. Some leaf drop after repotting is normal for this plant and is not evidence that you did it badly. Keep it in the same spot, in the same light, at the same temperature, and change nothing else. Do not feed for six to eight weeks, because fertilizer on damaged roots does harm rather than good, and do not prune while the plant is recovering.
Write down the repotting date, the pot size you moved up to, the mix you used, and the state of the roots when you saw them. Then note when new growth appeared. That record tells you how long this plant takes to settle, and next time round it stops you from panicking in week three and undoing your own work.
If you did nothing more than lift a plant into a slightly bigger pot and it is still bare eight weeks later in warm conditions, the problem is at the roots or in the temperature of its position, not in the repotting itself.