Plant care
Alternanthera reineckii 'Mini'temperature & humidity
Alternanthera reineckii 'Mini'
More about alternanthera reineckii 'mini'
Ideal temperature for alternanthera reineckii 'mini'
Aim for 22-28°C (72-82°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 22°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Alternanthera reineckii 'Mini' is comparatively hardy (USDA Tropical aquarium plant; not frost-hardy, kept in heated aquaria, RHS undefined). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for alternanthera reineckii 'mini'
Alternanthera reineckii 'Mini' sits happiest at around 100% (submersed) relative humidity. Not a factor submersed. The emersed farmed form needs high humidity until it converts to its red submersed leaves in the aquarium. 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.
Alternanthera reineckii 'Mini' temperature & humidity — frequently asked questions
What temperature is best for alternanthera reineckii 'mini'?
Alternanthera reineckii 'Mini' grows best between 22-28°C (72-82°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 alternanthera reineckii 'mini' tolerate?
Alternanthera reineckii 'Mini' starts to suffer below roughly 22°C. It tolerates a cold dormant period within USDA Tropical aquarium plant; not frost-hardy, kept in heated aquaria, but a wet cold root zone is more dangerous than cold air.
What humidity does alternanthera reineckii 'mini' need?
Alternanthera reineckii 'Mini' prefers about 100% (submersed) relative humidity. Not a factor submersed. The emersed farmed form needs high humidity until it converts to its red submersed leaves in the aquarium.
How do I raise humidity for alternanthera reineckii 'mini'?
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 alternanthera reineckii 'mini' live outside?
Alternanthera reineckii 'Mini' is rated for USDA zone Tropical aquarium plant; not frost-hardy, kept in heated aquaria. Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More alternanthera reineckii 'mini' care
In the UK? Keeping alternanthera reineckii 'mini' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full alternanthera reineckii 'mini' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.