Cold hardiness & minimum temperature

Is Sinningia eumorpha (Sinningia eumorpha)cold hardy? Hardiness zone & min temp

Also called eumorpha sinningia.

More about sinningia eumorpha

About Sinningia eumorpha

Sinningia eumorpha · also called eumorpha sinningia · flowering

Sinningia eumorpha is a compact Brazilian tuberous gesneriad bearing nodding, slipper-shaped white flowers often flushed with a violet throat above glossy, low-growing leaves. A key parent of many hybrids, it is easy and floriferous given bright indirect light, warmth and even moisture, then rests as a dormant tuber over winter before reshooting in spring.

Cold limit: USDA 10-11 (frost-tender; grown indoors or as a container plant in most climates) · RHS H1c (18-27°C)

Watch for — Bud drop: Sudden temperature swings, dry air or erratic watering make buds fall before opening. Keep conditions steady and humidity moderate.

What sinningia eumorpha's hardiness rating actually means

Sinningia eumorpha 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-11 (frost-tender; grown indoors or as a container plant 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 5 °C (and never frost). Sinningia eumorpha has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for sinningia eumorpha as it gets too cold:

Below about about 5 °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 sinningia eumorpha go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 sinningia eumorpha can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Sinningia eumorpha hardiness — frequently asked questions

Is sinningia eumorpha cold hardy?

Sinningia eumorpha 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. Sinningia eumorpha can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (frost-tender; grown indoors or as a container plant in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature sinningia eumorpha can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Sinningia eumorpha has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is sinningia eumorpha?

Sinningia eumorpha is rated USDA 10-11 (frost-tender; grown indoors or as a container plant in most climates) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can sinningia eumorpha survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 sinningia eumorpha below its minimum temperature?

Below about about 5 °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.