Cold hardiness & minimum temperature

Is Amazonian Traveller's Tree (Phenakospermum guyannense)cold hardy? Hardiness zone & min temp

Also called Amazonian traveller's tree, South American traveller's palm, Palulu.

More about amazonian traveller's tree

About Amazonian Traveller's Tree

Phenakospermum guyannense · also called Amazonian traveller's tree, South American traveller's palm · tropical

Phenakospermum guyannense is the sole species in its genus and the only Strelitziaceae native to South America, occurring naturally across the Amazon basin from Venezuela and Colombia south to Bolivia and Brazil. It forms a giant herbaceous plant with a banana-like pseudostem reaching 6–9 m, producing paddle-shaped leaves arranged in a fan plane and spectacular long-lasting inflorescences with orange-and-white boat-shaped bracts. It demands year-round warmth and humidity with rich, moist but free-draining soil — a brief frost will kill it. Phenakospermum is not individually assessed by ASPCA, but its family Strelitziaceae (including Strelitzia reginae) is listed as mildly toxic to cats, dogs, and horses, so treat it as mildly-toxic.

Cold limit: USDA 10-11 · RHS H1c (18–35°C)

Watch for — Root and crown rot: The most common cultivation failure outside tropical climates; caused by poorly drained soil or cold, wet conditions. Improve drainage before planting and never allow water to pool at the pseudostem base.

What amazonian traveller's tree's hardiness rating actually means

Amazonian Traveller's Tree 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. 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 5 °C (and never frost). Amazonian Traveller's Tree has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for amazonian traveller's tree as it gets too cold:

Below about about 5 °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 amazonian traveller's tree go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 amazonian traveller's tree can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Amazonian Traveller's Tree hardiness — frequently asked questions

Is amazonian traveller's tree cold hardy?

Amazonian Traveller's Tree 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. Amazonian Traveller's Tree 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 amazonian traveller's tree can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Amazonian Traveller's Tree has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is amazonian traveller's tree?

Amazonian Traveller's Tree is rated USDA 10-11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can amazonian traveller's tree survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 amazonian traveller's tree below its minimum temperature?

Below about about 5 °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.