Cold hardiness & minimum temperature

Is White Floss Silk Tree (Ceiba insignis)cold hardy? Hardiness zone & min temp

Also called White Floss Silk Tree, Paina de Seda, Yachan.

More about white floss silk tree

About White Floss Silk Tree

Ceiba insignis · also called White Floss Silk Tree, Paina de Seda · tropical

A spectacular deciduous tropical tree from dry valleys of Peru and Ecuador (Malvaceae) with a spiny, bottle-shaped water-storing trunk and showy white to pale-yellow flowers. Grows rapidly in full sun with well-drained fertile soil. Often cultivated as a large container specimen or bonsai; can reach 15 m outdoors in frost-free climates.

Cold limit: USDA 9–11 · RHS H1b (10–35°C)

Watch for — Frost damage: Young plants are frost-intolerant; even established specimens may suffer foliar damage below 0°C. Bring containers indoors before the first frost and maintain above 5°C. In borderline zones, protect the base with deep mulch.

What white floss silk tree's hardiness rating actually means

White Floss Silk 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 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 9–11 — 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). White Floss Silk Tree has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

White Floss Silk Tree hardiness — frequently asked questions

Is white floss silk tree cold hardy?

White Floss Silk 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. White Floss Silk Tree can only live outside year-round in genuinely frost-free climates (roughly USDA 9–11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature white floss silk tree can survive?

What hardiness zone is white floss silk tree?

White Floss Silk Tree is rated USDA 9–11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can white floss silk tree 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 white floss silk tree 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.