Plant care
Dahlia 'Bora Bora'temperature & humidity
Dahlia 'Bora Bora'
More about dahlia 'bora bora'
Ideal temperature for dahlia 'bora bora'
Aim for 15-30°C (59-86°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 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Dahlia 'Bora Bora' is comparatively hardy (USDA 8-11 (tubers lifted and stored over winter in colder zones), RHS H3). 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 dahlia 'bora bora'
Dahlia 'Bora Bora' sits happiest at around Ambient outdoor humidity relative humidity. An outdoor garden plant with no special humidity needs; good air circulation around the foliage matters more than humidity and helps prevent powdery mildew on the leaves. 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.
Dahlia 'Bora Bora' temperature & humidity — frequently asked questions
What temperature is best for dahlia 'bora bora'?
Dahlia 'Bora Bora' grows best between 15-30°C (59-86°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 dahlia 'bora bora' tolerate?
Dahlia 'Bora Bora' starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 8-11 (tubers lifted and stored over winter in colder zones), but a wet cold root zone is more dangerous than cold air.
What humidity does dahlia 'bora bora' need?
Dahlia 'Bora Bora' prefers about Ambient outdoor humidity relative humidity. An outdoor garden plant with no special humidity needs; good air circulation around the foliage matters more than humidity and helps prevent powdery mildew on the leaves.
How do I raise humidity for dahlia 'bora bora'?
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 dahlia 'bora bora' live outside?
Dahlia 'Bora Bora' is rated for USDA zone 8-11 (tubers lifted and stored over winter in colder zones) and RHS hardiness H3. 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 dahlia 'bora bora' care
In the UK? Keeping dahlia 'bora bora' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full dahlia 'bora bora' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.