Cold hardiness & minimum temperature

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

Also called Reflexed-Nerve Anthurium.

More about anthurium reflexinervium

About Anthurium Reflexinervium

Anthurium reflexinervium · also called Reflexed-Nerve Anthurium · tropical

Anthurium reflexinervium is a prized collector aroid from Venezuela with thick, stiff, deeply quilted leaves and dramatically sunken, reflexed veins. It is a slow-growing epiphytic species needing very high humidity, warm temperatures and a chunky, fast-draining mix. Treat it like other warm-growing velvet-textured anthuriums: bright indirect light and steady moisture without sogginess.

Cold limit: USDA 11-12 (indoor or heated greenhouse in most US homes) · RHS H1a (20-28°C)

Watch for — Stalled, deformed new growth: Often too little light or temperatures that are too cool. Provide bright indirect light and keep above 18°C.

What anthurium reflexinervium's hardiness rating actually means

Anthurium Reflexinervium 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11-12 (indoor or heated greenhouse 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 above about 15 °C (warm, never cold). Anthurium Reflexinervium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for anthurium reflexinervium as it gets too cold:

Below about above about 15 °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 reflexinervium go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 reflexinervium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Anthurium Reflexinervium hardiness — frequently asked questions

Is anthurium reflexinervium cold hardy?

Anthurium Reflexinervium 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 Reflexinervium can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor or heated greenhouse in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature anthurium reflexinervium can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Anthurium Reflexinervium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is anthurium reflexinervium?

Anthurium Reflexinervium is rated USDA 11-12 (indoor or heated greenhouse in most US homes) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can anthurium reflexinervium survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 reflexinervium below its minimum temperature?

Below about above about 15 °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.