Cold hardiness & minimum temperature

Is Lace Flower Vine (Episcia dianthiflora)cold hardy? Hardiness zone & min temp

Also called Lace Flower Vine, Lace Flower, White Lace Episcia.

More about lace flower vine

About Lace Flower Vine

Episcia dianthiflora · also called Lace Flower Vine, Lace Flower · houseplant

Lace Flower Vine is a delicate trailing gesneriad with velvety, emerald-green leaves and exquisite pure white tubular flowers whose petal margins are intricately fringed like fine lacework. It spreads by stolons and is ideal for terrariums or hanging baskets. ASPCA-listed non-toxic — a beautiful pet-safe houseplant.

Cold limit: USDA 10-12 (indoor-only in most homes) · RHS H1c (18-27°C)

Watch for — Brown leaf spots: Almost always caused by cold or chlorinated water touching the velvety leaves. Water only at the soil level with room-temperature water.

What lace flower vine's hardiness rating actually means

Lace Flower Vine 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 10-12 (indoor-only in most homes) — 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). Lace Flower Vine has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for lace flower vine 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 lace flower vine 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 lace flower vine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Lace Flower Vine hardiness — frequently asked questions

Is lace flower vine cold hardy?

Lace Flower Vine 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. Lace Flower Vine can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor-only in most homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature lace flower vine can survive?

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

What hardiness zone is lace flower vine?

Lace Flower Vine is rated USDA 10-12 (indoor-only in most homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can lace flower vine 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 lace flower vine 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.