Cold hardiness & minimum temperature

Is Anthurium radicans x dressleri (Anthurium radicans x dressleri)cold hardy? Hardiness zone & min temp

Also called hybrid velvet anthurium.

More about anthurium radicans x dressleri

About Anthurium radicans x dressleri

Anthurium radicans x dressleri · also called hybrid velvet anthurium · tropical

Anthurium radicans x dressleri is a popular collector's hybrid pairing the deeply bullate, creeping radicans with the velvety dark, long-leaved dressleri. The result has heart-shaped, puckered, dark velvety foliage on a more compact, manageable plant than dressleri alone. It wants warm, very humid, airy conditions and bright indirect light, and is grown almost exclusively for its dramatic textured velvet leaves.

Cold limit: USDA 11-12 (indoor/terrarium in most US homes) · RHS H1b (18-27°C)

What anthurium radicans x dressleri's hardiness rating actually means

Anthurium radicans x dressleri 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 11-12 (indoor/terrarium 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 10 °C (sustained cold below this is damaging). Anthurium radicans x dressleri has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for anthurium radicans x dressleri 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 anthurium radicans x dressleri 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 anthurium radicans x dressleri can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Anthurium radicans x dressleri hardiness — frequently asked questions

Is anthurium radicans x dressleri cold hardy?

Anthurium radicans x dressleri 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. Anthurium radicans x dressleri can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor/terrarium in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature anthurium radicans x dressleri can survive?

What hardiness zone is anthurium radicans x dressleri?

Anthurium radicans x dressleri is rated USDA 11-12 (indoor/terrarium in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can anthurium radicans x dressleri 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 anthurium radicans x dressleri 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.