Cold hardiness & minimum temperature

Is Spathoglottis kimballiana (Spathoglottis kimballiana)cold hardy? Hardiness zone & min temp

Also called Kimball's Spathoglottis, Yellow Ground Orchid.

More about spathoglottis kimballiana

About Spathoglottis kimballiana

Spathoglottis kimballiana · also called Kimball's Spathoglottis, Yellow Ground Orchid · tropical

Spathoglottis kimballiana is a warm-growing Southeast Asian terrestrial orchid bearing bright golden-yellow flowers above pleated, grassy leaves. Less common than the purple Philippine ground orchid, it shares the same easy terrestrial culture: partial shade, warmth, steady moisture and a rich, well-drained mix. Given consistent warmth and humidity it flowers freely over a long season.

Cold limit: USDA 10-12 (outdoors in frost-free regions; indoor/greenhouse elsewhere) · RHS H1b (18-32°C)

Watch for — Cold sensitivity: Temperatures below about 10°C check growth and damage foliage. Protect from cold and never expose to frost.

What spathoglottis kimballiana's hardiness rating actually means

Spathoglottis kimballiana 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 (outdoors in frost-free regions; indoor/greenhouse elsewhere) — 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). Spathoglottis kimballiana has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Spathoglottis kimballiana hardiness — frequently asked questions

Is spathoglottis kimballiana cold hardy?

Spathoglottis kimballiana 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. Spathoglottis kimballiana can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (outdoors in frost-free regions; indoor/greenhouse elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature spathoglottis kimballiana can survive?

What hardiness zone is spathoglottis kimballiana?

Spathoglottis kimballiana is rated USDA 10-12 (outdoors in frost-free regions; indoor/greenhouse elsewhere) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can spathoglottis kimballiana 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 spathoglottis kimballiana 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.