Cold hardiness & minimum temperature

Is Kramer's Butterfly Orchid (Psychopsis krameriana)cold hardy? Hardiness zone & min temp

Also called Kramer's Orchid, Butterfly Orchid.

More about kramer's butterfly orchid

About Kramer's Butterfly Orchid

Psychopsis krameriana · also called Kramer's Orchid, Butterfly Orchid · tropical

Psychopsis krameriana is a warm-growing epiphytic orchid from Central and South America producing successive butterfly-like flowers in orange-yellow and red-brown on long-lived spikes. Like other Psychopsis, it blooms sequentially from the same spike for years. ASPCA classifies orchids as non-toxic and this species is pet-safe.

Cold limit: USDA 11-12 · RHS H1b (18-32°C)

What kramer's butterfly orchid's hardiness rating actually means

Kramer's Butterfly Orchid 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 11-12 — 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). Kramer's Butterfly Orchid has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for kramer's butterfly orchid 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 kramer's butterfly orchid 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 kramer's butterfly orchid can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Kramer's Butterfly Orchid hardiness — frequently asked questions

Is kramer's butterfly orchid cold hardy?

Kramer's Butterfly Orchid 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. Kramer's Butterfly Orchid can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature kramer's butterfly orchid can survive?

What hardiness zone is kramer's butterfly orchid?

Kramer's Butterfly Orchid is rated USDA 11-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can kramer's butterfly orchid 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 kramer's butterfly orchid 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.