Cold hardiness & minimum temperature

Is White Magic Flower (Achimenes candida)cold hardy? Hardiness zone & min temp

Also called White Magic Flower, White Achimenes.

More about white magic flower

About White Magic Flower

Achimenes candida · also called White Magic Flower, White Achimenes · houseplant

Achimenes candida is a white-flowered magic flower from Mexico, producing small, delicate funnel-shaped white blooms with yellow throats on brownish-red stems lined with rough, toothed leaves. A summer-to-autumn bloomer, it grows from scaly rhizomes and enters winter dormancy. It rewards consistent warmth, indirect light, and high humidity with weeks of elegant bloom.

Cold limit: USDA 10–12 · RHS H1b (18–24°C active growth; minimum 13°C in winter storage)

Watch for — Yellowing leaves and early die-back: Caused by soil drying out completely, chilling below 15°C, or natural dormancy onset. In summer, a yellow plant that was not deliberately dried out signals drought or cold stress — address watering and temperature first.

What white magic flower's hardiness rating actually means

White Magic Flower 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). White Magic Flower has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

White Magic Flower hardiness — frequently asked questions

Is white magic flower cold hardy?

White Magic Flower 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. White Magic Flower 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 white magic flower can survive?

What hardiness zone is white magic flower?

White Magic Flower 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 white magic flower 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 white magic flower 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.