How-to Guide
Venus Flytrap and Carnivorous Plant Care
The short answer
Venus flytraps (Dionaea muscipula) and most carnivorous plants evolved in nutrient-poor bogs, so ordinary houseplant care harms them. NC State Extension says to water only with rainwater or distilled water, because treated (chlorinated) or hard water can kill the plant, and to keep the soil constantly wet in a lean mix of sphagnum moss or peat with vermiculite or sand.
Do not fertilize. NC State Extension states plainly: do not fertilize the plant; it gets its nutrients from the insects it catches, and fertilizer salts damage the roots.
The number-one killer is skipping winter dormancy. Flytraps need a cold, roughly three-to-four-month rest each winter (below about 50 degrees), during which they may blacken and die back; this is normal and they return in spring. And don't tease the traps closed for fun, because every snap wastes stored energy.
Water: mineral-free only
This is the rule people break first. NC State Extension specifies rainwater or distilled water only, warning that treated (chlorinated) water or hard water can kill the plant. Tap and most bottled water carry dissolved minerals and salts that accumulate in the soil and poison a bog plant adapted to pure rainwater.
Keep the soil constantly wet, not merely moist; NC State Extension says do not allow the soil to dry out. The common method is to stand the pot in a tray with a shallow depth of distilled or rainwater so it wicks up from below.
Soil, light, and no fertilizer
Use a lean, acidic, nutrient-free medium. NC State Extension recommends whole-fiber sphagnum moss, or equal parts peat moss and coarse vermiculite or sharp sand, never regular potting soil or compost.
Give it strong light: NC State lists full sun to partial shade, and a flytrap needs many hours of bright light to color up and stay vigorous. And do not feed it: NC State Extension says explicitly not to fertilize the plant, since it draws nutrients from captured prey and fertilizer will burn the roots.
Winter dormancy: the thing that kills them
More flytraps die from being kept warm and growing year-round than from any pest. These are temperate bog plants that require a genuine winter dormancy of several months, triggered by cold and shorter days. During dormancy the plant slows, and its traps and leaves may blacken and die back; this looks alarming but is normal, and the plant re-sprouts in spring.
NC State Extension notes Venus flytrap is winter-hardy outdoors in USDA zones 7 to 10, and can be grown in zones 5 and 6 with winter protection. A flytrap kept as a warm windowsill houseplant with no cold rest will typically decline over a year or two, so plan to give it a cold, bright, barely-watered dormant period each winter (an unheated porch, a cold windowsill, or protected outdoors in mild zones).
Don't play with the traps
It's tempting, but resist triggering the traps for entertainment. Each trap closes when prey disturbs two of the tactile hairs on the leaf, and snapping shut and reopening costs the plant energy. Repeatedly springing empty traps tires them, and an individual trap only cycles a limited number of times before it dies.
Let the plant catch its own food. If it's indoors and never catches anything, an occasional live or freshly-killed insect placed in a trap is enough; there is no need, ever, to add fertilizer or feed it meat from your plate, which rots and kills the trap.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- NC State Extension Plant Toolbox — Dionaea muscipula (Venus Flytrap) — Water only with rainwater or distilled water — treated (chlorinated) or hard water can kill the plant; keep soil constantly wet, do not let it dry out; plant in whole-fiber sphagnum moss or equal parts peat and coarse vermiculite/sharp sand; full sun to partial shade; do not fertilize the plant; traps close when prey disturbs two of the six tactile hairs; winter hardy in USDA zones 7-10, growable in zones 5-6 with winter protection