Cold hardiness & minimum temperature

Is Anthurium ochranthum (Anthurium ochranthum)cold hardy? Hardiness zone & min temp

Also called yellow-flowered anthurium.

More about anthurium ochranthum

About Anthurium ochranthum

Anthurium ochranthum · also called yellow-flowered anthurium · tropical

Anthurium ochranthum is a large, robust Central and South American aroid producing big, leathery, deeply lobed or sagittate leaves and pale yellowish spathes. A vigorous, warmth-demanding species, it wants bright indirect light, high humidity and an airy, free-draining mix. Give it room and a support: it can build into an imposing, broad-leaved specimen plant.

Cold limit: USDA 10-12 (indoor/greenhouse in most US climates) · RHS H1b (18-28°C)

Watch for — Large leaves crisping at edges: Low humidity relative to the leaf size. Raise humidity substantially and keep away from heat vents and draughts.

What anthurium ochranthum's hardiness rating actually means

Anthurium ochranthum 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/greenhouse in most US 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). Anthurium ochranthum has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Anthurium ochranthum hardiness — frequently asked questions

Is anthurium ochranthum cold hardy?

Anthurium ochranthum 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 ochranthum can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor/greenhouse in most US climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature anthurium ochranthum can survive?

What hardiness zone is anthurium ochranthum?

Anthurium ochranthum is rated USDA 10-12 (indoor/greenhouse in most US climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can anthurium ochranthum 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 ochranthum 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.