Cold hardiness & minimum temperature

Is Pili Nut (Canarium ovatum)cold hardy? Hardiness zone & min temp

Also called pili nut, Philippine nut.

More about pili nut

About Pili Nut

Canarium ovatum · also called pili nut, Philippine nut · edible

The pili nut is a large evergreen tropical tree from the Philippines, grown for its rich, almond-like kernels inside a hard-shelled fruit. It needs constant warmth, high humidity and frost-free conditions, thriving in zones 10-11. Trees are typically dioecious, so both sexes (or grafted bearing clones) are needed for fruit. It is wind-firm and drought-tolerant once established.

Cold limit: USDA 10-11 · RHS H1b (22 to 34°C)

Watch for — Frost intolerance: Cannot withstand even the slightest frost; outside zones 10-11 it must be grown under cover and kept consistently warm, never below about 12°C.

What pili nut's hardiness rating actually means

Pili 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). Pili Nut has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for pili 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 pili 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 pili nut can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Pili Nut hardiness — frequently asked questions

Is pili nut cold hardy?

Pili 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. Pili 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 pili nut can survive?

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

What hardiness zone is pili nut?

Pili 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 pili 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 pili 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.