Cold hardiness & minimum temperature

Is Tete Cycad (Encephalartos pterogonus)cold hardy? Hardiness zone & min temp

Also called Tete Cycad, Winged-cone Cycad.

More about tete cycad

About Tete Cycad

Encephalartos pterogonus · also called Tete Cycad, Winged-cone Cycad · tropical

Tete Cycad is a striking species from the lower Zambezi valley of Mozambique and Zimbabwe, named after the city of Tete. It produces a tall, elegant trunk topped with glossy, dark-green arching fronds. It is adapted to hot, seasonally dry lowveld conditions and is more heat-tolerant than highland Encephalartos. Best grown in tropical gardens or heated conservatories.

Cold limit: USDA 10–12 · RHS H1b (12–40°C)

Watch for — Cold damage and frost: Being a hot lowveld species, Encephalartos pterogonus is particularly sensitive to cold. Temperatures below 12°C cause leaf discolouration and stunted new growth; frost kills foliage and can rot the crown. In temperate climates, must be overwintered frost-free and kept very dry.

What tete cycad's hardiness rating actually means

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

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

Tete Cycad hardiness — frequently asked questions

Is tete cycad cold hardy?

Tete Cycad 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. Tete Cycad 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 tete cycad can survive?

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

What hardiness zone is tete cycad?

Tete Cycad 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 tete cycad 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 tete cycad 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.