Cold hardiness & minimum temperature

Is Sago Palm 'Aurea' (Cycas revoluta 'Aurea')cold hardy? Hardiness zone & min temp

Also called Golden Sago Palm.

More about sago palm 'aurea'

About Sago Palm 'Aurea'

Cycas revoluta 'Aurea' · also called Golden Sago Palm · houseplant

'Aurea' is a golden-flushed form of the sago palm, a slow, ancient cycad (not a true palm) prized for its symmetrical rosette of stiff, glossy fronds that emerge with a warm yellow-gold cast. It makes a long-lived, architectural houseplant but is extremely poisonous to pets, so placement matters.

Cold limit: USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) · RHS H3 (16-28°C)

Watch for — Crown and root rot: Overwatering, especially in winter, rots the caudex and roots. Use gritty mix, let it dry between waterings, and never leave it standing in water.

What sago palm 'aurea''s hardiness rating actually means

Sago Palm 'Aurea' is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) — 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 −5 to 1 °C — a light, short frost only. Sago Palm 'Aurea' shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for sago palm 'aurea' as it gets too cold:

Down to roughly about −5 to 1 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can sago palm 'aurea' go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 sago palm 'aurea' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline sago palm 'aurea'

Sago Palm 'Aurea' is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Sago Palm 'Aurea' hardiness — frequently asked questions

Is sago palm 'aurea' cold hardy?

Sago Palm 'Aurea' is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) (and sheltered UK gardens) sago palm 'aurea' can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature sago palm 'aurea' can survive?

Minimum survivable temperature is roughly about −5 to 1 °C — a light, short frost only. Sago Palm 'Aurea' shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is sago palm 'aurea'?

Sago Palm 'Aurea' is rated USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can sago palm 'aurea' survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-11 (indoor in most US and UK homes; tolerates brief light frost but damaged below about -4°C) or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect sago palm 'aurea' from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.