Plant care
Ludwigia repenstemperature & humidity
Ludwigia repens
More about ludwigia repens
Ideal temperature for ludwigia repens
Ludwigia repens is comfortable in any room a person is comfortable in, roughly 18-28°C (64-82°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Ludwigia repens is frost-tender (USDA Not applicable as a houseplant; native and pond-hardy roughly USDA 8-11 (tropical/subtropical, grown indoors in heated aquariums elsewhere), RHS undefined). It cannot survive a frost, so in most of the US and UK it lives indoors year-round or summers outside and comes back in well before the first autumn frost — once nights drop toward 10-12°C is the cue, not the first frost warning. Acclimate it over a week when moving between indoors and out so the leaves do not shock.
Humidity for ludwigia repens
Ludwigia repens sits happiest at around 100% (submerged aquatic) relative humidity. Grown fully underwater, so ambient humidity does not apply. It also grows emersed in humid bog and pond-margin settings, where it produces small yellow flowers above the water. The usual low-humidity tell is crisp brown leaf tips and edges while the soil moisture is fine — a sign the air, not the watering, is the problem. If you need to raise it, the reliable methods are grouping plants together, standing the pot on a tray of damp pebbles (the pot above the waterline, never in it), or running a small humidifier in winter when indoor heating dries the air most. Misting is the least effective — it raises humidity for minutes, not hours.
Ludwigia repens temperature & humidity — frequently asked questions
What temperature is best for ludwigia repens?
Ludwigia repens grows best between 18-28°C (64-82°F). Keep it out of cold draughts, off freezing windowsills in winter, and away from the hot dry air directly above radiators — the extremes matter far more than the average room temperature.
How cold can ludwigia repens tolerate?
Ludwigia repens starts to suffer below roughly 18°C. It is frost-tender and will be damaged or killed by a frost, so bring it indoors once nights fall toward 10-12°C.
What humidity does ludwigia repens need?
Ludwigia repens prefers about 100% (submerged aquatic) relative humidity. Grown fully underwater, so ambient humidity does not apply. It also grows emersed in humid bog and pond-margin settings, where it produces small yellow flowers above the water.
How do I raise humidity for ludwigia repens?
Group it with other plants, stand the pot on a tray of damp pebbles (kept above the waterline), or run a small humidifier in winter. Misting only helps for a few minutes, so it is the weakest option for a plant that genuinely needs more humidity.
Can ludwigia repens live outside?
Ludwigia repens is rated for USDA zone Not applicable as a houseplant; native and pond-hardy roughly USDA 8-11 (tropical/subtropical, grown indoors in heated aquariums elsewhere). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More ludwigia repens care
In the UK? Keeping ludwigia repens warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full ludwigia repens care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.