Cold hardiness & minimum temperature

Is Cryptanthus 'Pink Starlight' (Cryptanthus 'Pink Starlight')cold hardy? Hardiness zone & min temp

Also called pink starlight earth star.

More about cryptanthus 'pink starlight'

About Cryptanthus 'Pink Starlight'

Cryptanthus 'Pink Starlight' · also called pink starlight earth star · tropical

Cryptanthus 'Pink Starlight' is a flat, ground-hugging earth star bromeliad with wavy, banded leaves striped in cream and flushed pink. Unlike tank bromeliads it is terrestrial and rosette-flat, grown for foliage rather than flowers. It needs bright indirect light to hold its colour, an evenly moist but free-draining mix, and the warm, humid air of a tropical houseplant.

Cold limit: USDA 10-11 (indoor in most US and UK homes) · RHS H1b (18-27°C)

What cryptanthus 'pink starlight''s hardiness rating actually means

Cryptanthus 'Pink Starlight' 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 10-11 (indoor in most US and UK 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 10 °C (sustained cold below this is damaging). Cryptanthus 'Pink Starlight' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for cryptanthus 'pink starlight' 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 cryptanthus 'pink starlight' 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 cryptanthus 'pink starlight' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Cryptanthus 'Pink Starlight' hardiness — frequently asked questions

Is cryptanthus 'pink starlight' cold hardy?

Cryptanthus 'Pink Starlight' 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. Cryptanthus 'Pink Starlight' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor in most US and UK homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature cryptanthus 'pink starlight' can survive?

What hardiness zone is cryptanthus 'pink starlight'?

Cryptanthus 'Pink Starlight' is rated USDA 10-11 (indoor in most US and UK homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can cryptanthus 'pink starlight' 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 cryptanthus 'pink starlight' 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.