Cold hardiness & minimum temperature

Is Masdevallia Angel Frost (Masdevallia 'Angel Frost')cold hardy? Hardiness zone & min temp

Also called Angel Frost Masdevallia.

More about masdevallia angel frost

About Masdevallia Angel Frost

Masdevallia 'Angel Frost' · also called Angel Frost Masdevallia · tropical

Masdevallia 'Angel Frost' is a popular primary hybrid (M. veitchiana x M. strobelii) bred for warm-orange flowers veined and tailed in the parents' colours, and for being more heat-tolerant and free-flowering than many species. Tuft-forming and intermediate-growing, it is one of the easier Masdevallias for a humid, airy windowsill or growcase.

Cold limit: USDA 10-11 (intermediate greenhouse/indoor only) · RHS H1b (13-26°C)

Watch for — Bud blast: Buds yellow and drop in dry, hot or fluctuating air; though hardier than the species, it still needs steady humidity and temperatures while in spike.

What masdevallia angel frost's hardiness rating actually means

Masdevallia Angel Frost 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 10-11 (intermediate greenhouse/indoor only) — 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). Masdevallia Angel Frost has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Masdevallia Angel Frost hardiness — frequently asked questions

Is masdevallia angel frost cold hardy?

Masdevallia Angel Frost 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. Masdevallia Angel Frost can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (intermediate greenhouse/indoor only)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature masdevallia angel frost can survive?

What hardiness zone is masdevallia angel frost?

Masdevallia Angel Frost is rated USDA 10-11 (intermediate greenhouse/indoor only) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can masdevallia angel frost 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 masdevallia angel frost 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.