Cold hardiness & minimum temperature

Is Kola Nut (Cola nitida)cold hardy? Hardiness zone & min temp

Also called kola nut, bitter kola, cola nut.

More about kola nut

About Kola Nut

Cola nitida · also called kola nut, bitter kola · edible

The kola nut tree is a large evergreen from West African rainforests, grown for caffeine-rich seeds traditionally chewed as a stimulant and used in cola flavourings. It demands constant tropical warmth, full sun and deep, moist soil, fruiting only in frost-free zones 10-11. Because the seeds contain caffeine and theobromine, they are toxic to dogs and cats.

Cold limit: USDA 10-11 · RHS H1b (23 to 28°C)

Watch for — Strict frost intolerance: Cannot tolerate frost or temperatures much below 13-15°C; outside zones 10-11 it must be grown under glass and kept consistently warm.

What kola nut's hardiness rating actually means

Kola Nut is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 10-11 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Kola Nut has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for kola nut as it gets too cold:

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can kola nut go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when kola nut can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Kola Nut hardiness — frequently asked questions

Is kola nut cold hardy?

Kola Nut is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Kola Nut can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature kola nut can survive?

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Kola Nut has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is kola nut?

Kola Nut is rated USDA 10-11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can kola nut survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to kola nut below its minimum temperature?

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.