Plant care
Ping Pong Purple globe amaranthtemperature & humidity
Gomphrena globosa 'Ping Pong Purple'
More about ping pong purple globe amaranth
Ideal temperature for ping pong purple globe amaranth
Aim for 18–38°C (64–100°F) 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
Ping Pong Purple globe amaranth is frost-tender (USDA 2–11 (grown as annual), RHS H2). 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 ping pong purple globe amaranth
Ping Pong Purple globe amaranth sits happiest at around 30–70% relative humidity. Tolerates both humid and dry outdoor conditions well. The species' heat and humidity tolerance is a key virtue in warm summer climates. Ensure adequate spacing for air flow to reduce any foliar fungal risk. 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.
Ping Pong Purple globe amaranth temperature & humidity — frequently asked questions
What temperature is best for ping pong purple globe amaranth?
Ping Pong Purple globe amaranth grows best between 18–38°C (64–100°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 ping pong purple globe amaranth tolerate?
Ping Pong Purple globe amaranth 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 ping pong purple globe amaranth need?
Ping Pong Purple globe amaranth prefers about 30–70% relative humidity. Tolerates both humid and dry outdoor conditions well. The species' heat and humidity tolerance is a key virtue in warm summer climates. Ensure adequate spacing for air flow to reduce any foliar fungal risk.
How do I raise humidity for ping pong purple globe amaranth?
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 ping pong purple globe amaranth live outside?
Ping Pong Purple globe amaranth is rated for USDA zone 2–11 (grown as annual) and RHS hardiness H2. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More ping pong purple globe amaranth care
In the UK? Keeping ping pong purple globe amaranth warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full ping pong purple globe amaranth care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.