Cold hardiness & minimum temperature

Is Queen of Hearts Plant (Homalomena rubescens)cold hardy? Hardiness zone & min temp

Also called queen of hearts plant, queen of hearts.

More about queen of hearts plant

About Queen of Hearts Plant

Homalomena rubescens · also called queen of hearts plant, queen of hearts · houseplant

Homalomena rubescens is a compact tropical aroid from South and Southeast Asia prized for its glossy, heart-shaped leaves with reddish undersides. It tolerates lower light than most aroids, prefers consistently warm and humid conditions, and rewards minimal watering with lush foliage. An excellent low-maintenance houseplant for shaded interiors.

Cold limit: USDA 10-12 · RHS H1b (18–28°C)

What queen of hearts plant's hardiness rating actually means

Queen of Hearts Plant 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 — 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). Queen of Hearts Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for queen of hearts plant 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 queen of hearts plant 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 queen of hearts plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Queen of Hearts Plant hardiness — frequently asked questions

Is queen of hearts plant cold hardy?

Queen of Hearts Plant 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. Queen of Hearts Plant can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature queen of hearts plant can survive?

What hardiness zone is queen of hearts plant?

Queen of Hearts Plant is rated USDA 10-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can queen of hearts plant 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 queen of hearts plant 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.