Plant care
Blue Pickerelweedtemperature & humidity
Pontederia azurea
More about blue pickerelweed
Ideal temperature for blue pickerelweed
Blue Pickerelweed is comfortable in any room a person is comfortable in, roughly 5–38°C (active growth 18–35°C) (41–100°F (active growth 64–95°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 5°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Blue Pickerelweed is frost-tender (USDA 8–11, RHS H1b). 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 blue pickerelweed
Blue Pickerelweed sits happiest at around Not applicable (outdoor aquatic/marginal) relative humidity. Thrives in warm, humid environments characteristic of its native South American wetland habitats. Suitable for tropical and subtropical garden conditions; bring indoors or treat as an annual in temperate climates where frost occurs. 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.
Blue Pickerelweed temperature & humidity — frequently asked questions
What temperature is best for blue pickerelweed?
Blue Pickerelweed grows best between 5–38°C (active growth 18–35°C) (41–100°F (active growth 64–95°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 blue pickerelweed tolerate?
Blue Pickerelweed starts to suffer below roughly 5°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 blue pickerelweed need?
Blue Pickerelweed prefers about Not applicable (outdoor aquatic/marginal) relative humidity. Thrives in warm, humid environments characteristic of its native South American wetland habitats. Suitable for tropical and subtropical garden conditions; bring indoors or treat as an annual in temperate climates where frost occurs.
How do I raise humidity for blue pickerelweed?
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 blue pickerelweed live outside?
Blue Pickerelweed is rated for USDA zone 8–11 and RHS hardiness H1b. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More blue pickerelweed care
In the UK? Keeping blue pickerelweed warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full blue pickerelweed care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.