Cold hardiness & minimum temperature

Is Palo Santo (Bursera graveolens)cold hardy? Hardiness zone & min temp

Also called Palo Santo, Holy Wood, Sacred Wood.

More about palo santo

About Palo Santo

Bursera graveolens · also called Palo Santo, Holy Wood · tropical

Palo Santo is a resinous succulent tree from Ecuador and Peru prized for its fragrant wood. As a caudiciform houseplant it demands bright direct sun, extremely fast-draining soil, and a strict dry winter dormancy. Water sparingly in summer and almost not at all in winter. Frost-tender; best kept above 10 °C (50 °F) year-round.

Cold limit: USDA 10–12 · RHS H1b (15–35 °C)

Watch for — Failure to leaf out in spring: Usually caused by keeping the plant too cold or too wet during winter dormancy. Ensure minimum 15 °C and near-dry conditions in winter; move to full sun and resume watering as temperatures rise in spring.

What palo santo's hardiness rating actually means

Palo Santo 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 10–12 — 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). Palo Santo has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Palo Santo hardiness — frequently asked questions

Is palo santo cold hardy?

Palo Santo 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. Palo Santo can only live outside year-round in genuinely frost-free climates (roughly USDA 10–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature palo santo can survive?

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

What hardiness zone is palo santo?

Palo Santo is rated USDA 10–12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can palo santo 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 palo santo 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.