Cold hardiness & minimum temperature

Is Dwarf Rose-stripe Star (Cryptanthus bivittatus)cold hardy? Hardiness zone & min temp

Also called Dwarf Rose-stripe Star, Earth Star, Red Star Bromeliad, Pink Starlite.

More about dwarf rose-stripe star

About Dwarf Rose-stripe Star

Cryptanthus bivittatus · also called Dwarf Rose-stripe Star, Earth Star · tropical

Cryptanthus bivittatus is a compact terrestrial bromeliad native to Brazil's Atlantic Forest, forming a flat, spreading star-shaped rosette of strap-like, wavy-edged leaves that range from olive-green to deep pink-red depending on light levels, with two pale longitudinal stripes on each leaf. Unlike most bromeliads it has no water-storage cup and must be watered at the root zone. The most important care fact is that light intensity drives leaf colour — brighter light produces richer rose-pink tones, while low light results in predominantly green foliage. The ASPCA lists Cryptanthus bivittatus as non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16-27°C)

What dwarf rose-stripe star's hardiness rating actually means

Dwarf Rose-stripe Star 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 (indoor in most climates) — 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). Dwarf Rose-stripe Star has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for dwarf rose-stripe star 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 dwarf rose-stripe star 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 dwarf rose-stripe star can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Dwarf Rose-stripe Star hardiness — frequently asked questions

Is dwarf rose-stripe star cold hardy?

Dwarf Rose-stripe Star 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. Dwarf Rose-stripe Star can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature dwarf rose-stripe star can survive?

What hardiness zone is dwarf rose-stripe star?

Dwarf Rose-stripe Star is rated USDA 10-12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can dwarf rose-stripe star 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 dwarf rose-stripe star 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.