Cold hardiness & minimum temperature

Is Rhoeo Spathacea 'Tricolor' (Tradescantia spathacea 'Tricolor')cold hardy? Hardiness zone & min temp

Also called tricolor Moses in the cradle, tricolor oyster plant.

More about rhoeo spathacea 'tricolor'

About Rhoeo Spathacea 'Tricolor'

Tradescantia spathacea 'Tricolor' · also called tricolor Moses in the cradle, tricolor oyster plant · houseplant

This variegated oyster plant (formerly Rhoeo) forms upright rosettes of sword-shaped leaves striped cream, pink and green above, deep purple beneath. Tiny white flowers nestle in boat-like bracts at the base. Give it bright indirect light to hold the pink, water when the topsoil dries, and use free-draining soil. Striking but toxic to pets.

Cold limit: USDA 9-11 (indoor in most US homes) · RHS H1c (18-27°C)

What rhoeo spathacea 'tricolor''s hardiness rating actually means

Rhoeo Spathacea 'Tricolor' 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 9-11 (indoor in most US homes) — 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). Rhoeo Spathacea 'Tricolor' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for rhoeo spathacea 'tricolor' 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 rhoeo spathacea 'tricolor' 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 rhoeo spathacea 'tricolor' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Rhoeo Spathacea 'Tricolor' hardiness — frequently asked questions

Is rhoeo spathacea 'tricolor' cold hardy?

Rhoeo Spathacea 'Tricolor' 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. Rhoeo Spathacea 'Tricolor' can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature rhoeo spathacea 'tricolor' can survive?

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

What hardiness zone is rhoeo spathacea 'tricolor'?

Rhoeo Spathacea 'Tricolor' is rated USDA 9-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can rhoeo spathacea 'tricolor' 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 rhoeo spathacea 'tricolor' 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.