Cold hardiness & minimum temperature

Is False Aralia (Plerandra elegantissima)cold hardy? Hardiness zone & min temp

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.

Cold limit: USDA 10b-11 · RHS H1b (heated greenhouse / tropical; min 12-15°C, grown under glass or as a houseplant in the UK) (18-27°C)

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.

What false aralia's hardiness rating actually means

False Aralia is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 10b-11 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). False Aralia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for false aralia as it gets too cold:

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can false aralia go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when false aralia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

False Aralia hardiness — frequently asked questions

Is false aralia cold hardy?

False Aralia is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. False Aralia can only live outside year-round in genuinely frost-free climates (roughly USDA 10b-11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature false aralia can survive?

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). False Aralia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is false aralia?

False Aralia is rated USDA 10b-11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can false aralia survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to false aralia below its minimum temperature?

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.