Plant care
Almond 'Marcona'temperature & humidity
Prunus dulcis 'Marcona'
More about almond 'marcona'
Ideal temperature for almond 'marcona'
Aim for -12 to 40°C (10 to 104°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 -12°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Almond 'Marcona' is comparatively hardy (USDA 7-9 (Mediterranean / dry-summer climates), RHS H4). 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 almond 'marcona'
Almond 'Marcona' sits happiest at around Low relative humidity. Strongly favours dry-summer climates; humidity and wet weather at bloom or harvest invite brown rot and hull rot. Airy, open canopies are best. 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.
Almond 'Marcona' temperature & humidity — frequently asked questions
What temperature is best for almond 'marcona'?
Almond 'Marcona' grows best between -12 to 40°C (10 to 104°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 almond 'marcona' tolerate?
Almond 'Marcona' starts to suffer below roughly -12°C. It tolerates a cold dormant period within USDA 7-9 (Mediterranean / dry-summer climates), but a wet cold root zone is more dangerous than cold air.
What humidity does almond 'marcona' need?
Almond 'Marcona' prefers about Low relative humidity. Strongly favours dry-summer climates; humidity and wet weather at bloom or harvest invite brown rot and hull rot. Airy, open canopies are best.
How do I raise humidity for almond 'marcona'?
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 almond 'marcona' live outside?
Almond 'Marcona' is rated for USDA zone 7-9 (Mediterranean / dry-summer climates) and RHS hardiness H4. 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 almond 'marcona' care
In the UK? Keeping almond 'marcona' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full almond 'marcona' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.