Cold hardiness & minimum temperature

Is Beucker's Earth Star (Cryptanthus beuckeri)cold hardy? Hardiness zone & min temp

Also called Beucker Earth Star, Pink Earth Star.

More about beucker's earth star

About Beucker's Earth Star

Cryptanthus beuckeri · also called Beucker Earth Star, Pink Earth Star · houseplant

Cryptanthus beuckeri is a low-growing, flat-rosette bromeliad from Brazil with attractively wavy, pink-flushed leaves often marked with silver cross-banding. Unlike most bromeliads it grows primarily in the potting medium rather than as an epiphyte. Ideal as a terrarium plant. Bromeliads in this family are considered non-toxic to pets.

Cold limit: USDA 12 (indoor-only) · RHS H1c (18-27°C)

What beucker's earth star's hardiness rating actually means

Beucker's Earth 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 12 (indoor-only) — 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). Beucker's Earth Star has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for beucker's earth star 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 beucker's earth star 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 beucker's earth star can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Beucker's Earth Star hardiness — frequently asked questions

Is beucker's earth star cold hardy?

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

What is the minimum temperature beucker's earth star can survive?

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

What hardiness zone is beucker's earth star?

Beucker's Earth Star is rated USDA 12 (indoor-only) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can beucker's earth star 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 beucker's earth star 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.