Cold hardiness & minimum temperature

Is Homalomena 'Maggy' (Shield Plant) (Homalomena rubescens 'Maggy')cold hardy? Hardiness zone & min temp

Also called Shield Plant, Red Shield Plant, Queen of Hearts, Homalomena Maggy.

More about homalomena 'maggy' (shield plant)

About Homalomena 'Maggy' (Shield Plant)

Homalomena rubescens 'Maggy' · also called Shield Plant, Red Shield Plant · tropical

Homalomena 'Maggy' is a clumping tropical aroid grown for glossy, heart-shaped green leaves with red-blushed stems and undersides. Give it bright-to-medium indirect light, evenly moist well-draining soil, and humidity above 50 percent. It is an aroid containing calcium oxalate crystals, so it is not pet-safe and should be kept away from cats and dogs.

Cold limit: USDA USDA 10-12 (indoor houseplant elsewhere; not frost hardy) (15-32°C)

Watch for — Brown, crispy leaf edges: A sign the air is too dry. Raise humidity above 50 percent with a pebble tray, humidifier or grouping plants, and keep it away from radiators and draughts.

What homalomena 'maggy' (shield plant)'s hardiness rating actually means

Homalomena 'Maggy' (Shield 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA USDA 10-12 (indoor houseplant elsewhere; not frost hardy) — 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 5 °C (and never frost). Homalomena 'Maggy' (Shield Plant) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for homalomena 'maggy' (shield plant) as it gets too cold:

Below about about 5 °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 homalomena 'maggy' (shield plant) go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 homalomena 'maggy' (shield plant) can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Homalomena 'Maggy' (Shield Plant) hardiness — frequently asked questions

Is homalomena 'maggy' (shield plant) cold hardy?

Homalomena 'Maggy' (Shield 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. Homalomena 'Maggy' (Shield Plant) can only live outside year-round in genuinely frost-free climates (roughly USDA USDA 10-12 (indoor houseplant elsewhere; not frost hardy)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature homalomena 'maggy' (shield plant) can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Homalomena 'Maggy' (Shield Plant) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is homalomena 'maggy' (shield plant)?

Homalomena 'Maggy' (Shield Plant) is rated USDA USDA 10-12 (indoor houseplant elsewhere; not frost hardy) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can homalomena 'maggy' (shield plant) survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 homalomena 'maggy' (shield plant) below its minimum temperature?

Below about about 5 °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.