Cold hardiness & minimum temperature

Is Restrepia guttulata (Restrepia guttulata)cold hardy? Hardiness zone & min temp

Also called Spotted Restrepia.

More about restrepia guttulata

About Restrepia guttulata

Restrepia guttulata · also called Spotted Restrepia · tropical

Restrepia guttulata is a cool-growing miniature orchid from Andean cloud forests, named for the fine dotting on its flowers, which combine a spotted lip with two thread-like dorsal sepals. Single leaves sit on slim ramicauls and bloom repeatedly. Like its relatives it needs shade, very high humidity, cool temperatures and roots that stay constantly moist.

Cold limit: USDA 10-11 (indoor/terrarium in most climates) · RHS H1b (12-24°C)

What restrepia guttulata's hardiness rating actually means

Restrepia guttulata 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 (indoor/terrarium in most climates) — 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). Restrepia guttulata has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Restrepia guttulata hardiness — frequently asked questions

Is restrepia guttulata cold hardy?

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

What is the minimum temperature restrepia guttulata can survive?

What hardiness zone is restrepia guttulata?

Restrepia guttulata is rated USDA 10-11 (indoor/terrarium in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can restrepia guttulata 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 restrepia guttulata 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.