Cold hardiness & minimum temperature

Is Aglaonema Dud Unyamanee (Aglaonema 'Dud Unyamanee')cold hardy? Hardiness zone & min temp

Also called Dud Unyamanee Aglaonema, Star Aglaonema.

More about aglaonema dud unyamanee

About Aglaonema Dud Unyamanee

Aglaonema 'Dud Unyamanee' · also called Dud Unyamanee Aglaonema, Star Aglaonema · houseplant

Aglaonema 'Dud Unyamanee' is a striking Thai-bred Chinese evergreen with broad green leaves heavily speckled and splashed in pink, cream and white. It is forgiving but its colour deepens in good light. Keep it warm above 16C, water when the top few centimetres dry, and grow it in a loose, well-draining mix.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-27C)

Watch for — Yellowing leaves: Typically overwatering or cold stress. Allow the soil to dry more between waterings and keep the plant above 16C, away from draughts.

What aglaonema dud unyamanee's hardiness rating actually means

Aglaonema Dud Unyamanee 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 10-12 (indoor in most US homes) — 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). Aglaonema Dud Unyamanee has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for aglaonema dud unyamanee 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 aglaonema dud unyamanee 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 aglaonema dud unyamanee can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Aglaonema Dud Unyamanee hardiness — frequently asked questions

Is aglaonema dud unyamanee cold hardy?

Aglaonema Dud Unyamanee 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. Aglaonema Dud Unyamanee can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature aglaonema dud unyamanee can survive?

What hardiness zone is aglaonema dud unyamanee?

Aglaonema Dud Unyamanee is rated USDA 10-12 (indoor in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can aglaonema dud unyamanee 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 aglaonema dud unyamanee 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.