Around October or November, almost every new flytrap owner panics. The traps turn black one by one, new ones come up small and flat, and the plant looks half-dead. It almost certainly isn't. A Venus flytrap comes from the Carolinas, where winters are cold, and it needs a proper rest every year. What really kills flytraps is the kind thing people do next: bringing them into a warm room and keeping them going all winter.
01At a glance
- Blackening traps in autumn are normal. NC State Extension says they're expected, not a sign of death. The plant survives underground in its rhizome.
- It needs the cold: at least ten weeks somewhere cool. NC State gives roughly 2–10°C.
- It still needs light. Cool and bright, not cool and dark.
- Damp, not flooded: ease off the standing water for winter. Rainwater only, as always.
- Don't feed it, don't fertilise it, don't poke it.
02Why dormancy matters
NC State Extension explains that the main signal for dormancy is shortening day length, with cool temperatures reinforcing it. Above ground the plant dies back, while starch reserves in the rhizome fuel next spring's growth. In the wild, dormancy runs from about November into early spring, three to five months.
Skip it, and the plant slowly runs itself down. NC State says plants forced to keep growing through winter usually end up weak and stressed. Repeated years without a rest leave them less vigorous and more prone to disease. A Venus flytrap kept warm all winter often looks fine until the spring it doesn't come back.
03How cold is cold enough?
Our sources don't agree exactly, so here's the range plainly:
- NC State Extension gives roughly 2–10°C, for at least ten weeks, and says outdoor plants need protecting from hard freezes.
- The RHS's flytrap page asks for a cool winter rest, but above 10°C.
- The RHS's plant database rates Dionaea as H3: hardy in coastal and relatively mild parts of the UK, down to about −5 to 1°C.
- The New York Botanical Garden suggests a cold window at around 50°F (10°C).
The cautious middle is the coolest bright spot you have that stays frost-free. An unheated porch, a cold greenhouse, a windowsill in an unheated spare room, or a cold conservatory all work. A heated living room doesn't, and neither does a dark garage, because NYBG stresses the plant still needs light while dormant.
04Setting up the winter rest
- From autumn, let it feel the cooling nights. Don't rush it indoors.
- Move it to its winter spot once it has clearly slowed down, and pick a place where it can stay. NC State says consistency matters most. Don't switch between warm and cold.
- Cut back the water. In summer it stands in a tray of rainwater. For winter, our profile keeps it barely moist, and NC State keeps it moist but not waterlogged. Never let it dry out completely.
- Snip off fully black traps at the base with clean scissors. The RHS says grey mould lives on dead plant material and thrives in humid, crowded conditions, so clearing dead traps promptly and improving airflow helps prevent it.
- Leave it alone until new growth starts in spring. Then move it back into full sun with its tray topped up.
05Trumpet pitchers: same rest, outdoors
The trumpet pitcher (Sarracenia) needs the same cold rest. The RHS notes that Sarracenia generally lose some of their leaves over winter during dormancy, and suggests keeping them a little drier, cool and well ventilated. Outdoors, it suits a sheltered spot in full sun. Some hybrids, such as 'Judith Hindle', carry the same H3 rating as the flytrap, so in a cold, exposed garden a cold greenhouse or porch is the safer bet.
Leave the browning pitchers on over winter. Our profile explains they help shelter the crown. Tidy them away in late winter, before the flowers and new pitchers appear.
06Don't feed it, and don't play with the traps
- No meat, cheese or bits of your dinner. The RHS says traps only respond to live, moving prey and won't work on inanimate food. NYBG says never to feed animal flesh. A dormant plant isn't hunting anyway.
- No fertiliser in the compost, ever. It scorches the roots of a bog plant.
- No triggering traps for fun. The RHS says each trap closes at most about three times before it dies, and setting them off repeatedly weakens the plant.
Before placing a trumpet pitcher where pets or children can reach it, check the safety flags on our trumpet pitcher profile.
How we checked this
Every care and safety claim on this page is verified against horticultural and veterinary sources.
Sources: RHS — Venus fly trap: growing guide · RHS — Dionaea muscipula plant details · RHS — Sarracenia 'Judith Hindle' plant details · RHS — Grey mould · NC State Extension, New Hanover County — Venus flytrap dormancy · New York Botanical Garden — Advice on growing and caring for a Venus flytrap
Checked 8 October 2026. If our advice ever conflicts with the RHS, believe them and tell us.