Plant care
Summer Impala Lilytemperature & humidity
Adenium swazicum
More about summer impala lily
Ideal temperature for summer impala lily
Aim for 18–38°C (active growth); above 13°C to avoid dormancy damage (65–100°F (active growth); above 55°F to avoid dormancy damage) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Summer Impala Lily is frost-tender (USDA 10a–11b, RHS H1a). 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 summer impala lily
Summer Impala Lily sits happiest at around 30–50% relative humidity. Adapted to the dry lowveld of southern Africa; prefers low to moderate ambient humidity. High humidity raises root rot risk, especially during winter dormancy. Good air circulation is important. 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.
Summer Impala Lily temperature & humidity — frequently asked questions
What temperature is best for summer impala lily?
Summer Impala Lily grows best between 18–38°C (active growth); above 13°C to avoid dormancy damage (65–100°F (active growth); above 55°F to avoid dormancy damage). 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 summer impala lily tolerate?
Summer Impala Lily 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 summer impala lily need?
Summer Impala Lily prefers about 30–50% relative humidity. Adapted to the dry lowveld of southern Africa; prefers low to moderate ambient humidity. High humidity raises root rot risk, especially during winter dormancy. Good air circulation is important.
How do I raise humidity for summer impala lily?
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 summer impala lily live outside?
Summer Impala Lily is rated for USDA zone 10a–11b and RHS hardiness H1a. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More summer impala lily care
In the UK? Keeping summer impala lily warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full summer impala lily care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.