Cold hardiness & minimum temperature

Is Venus Flytrap (Dionaea muscipula)cold hardy? Hardiness zone & min temp

Also called Venus flytrap, Venus fly trap, Dionaea.

More about venus flytrap

About Venus Flytrap

Dionaea muscipula · also called Venus flytrap, Venus fly trap · houseplant

The Venus flytrap is a carnivorous bog plant whose hinged, trigger-haired traps snap shut on insects. Its one defining need is water purity: only rainwater, distilled, or reverse-osmosis water will do, as the dissolved minerals in tap water quickly kill it. It also demands bright direct sun and a cold winter dormancy.

Cold limit: USDA 7-10 (zones 5-6 with winter protection) · RHS H3 (hardy in coastal/milder UK, -5 to 1°C) (21-32°C)

Watch for — No winter dormancy: Flytraps need 3-4 months of cool (0-10°C / 35-50°F) dormancy with reduced light and water. Skipping it weakens the plant and eventually kills it after a year or two.

What venus flytrap's hardiness rating actually means

Venus Flytrap is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 7-10 (zones 5-6 with winter protection) — 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 to 1 °C — a light, short frost only. Venus Flytrap shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for venus flytrap as it gets too cold:

Down to roughly about −5 to 1 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can venus flytrap go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-10 (zones 5-6 with winter protection) or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 venus flytrap can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline venus flytrap

Venus Flytrap is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Venus Flytrap hardiness — frequently asked questions

Is venus flytrap cold hardy?

Venus Flytrap is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 7-10 (zones 5-6 with winter protection) (and sheltered UK gardens) venus flytrap can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature venus flytrap can survive?

Minimum survivable temperature is roughly about −5 to 1 °C — a light, short frost only. Venus Flytrap shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is venus flytrap?

Venus Flytrap is rated USDA 7-10 (zones 5-6 with winter protection) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can venus flytrap survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-10 (zones 5-6 with winter protection) or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect venus flytrap from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.