Cold hardiness & minimum temperature

Is Viguier's Angraecum (Angraecum viguieri)cold hardy? Hardiness zone & min temp

Also called Viguier's Angraecum.

More about viguier's angraecum

About Viguier's Angraecum

Angraecum viguieri · also called Viguier's Angraecum · tropical

A medium to large monopodial epiphyte from Madagascar's highlands at ~900 m, bearing 12–20 strap-shaped, slightly twisted dark green leaves on an erect stem. Produces axillary, sweetly fragrant white flowers in spring. Grows in intermediate to warm conditions with generous watering during growth and a modest winter reduction.

Cold limit: USDA 10–12 · RHS H1b (14–30 °C (day 20–30 °C; night minimum 14 °C))

Watch for — Delayed or absent flowering: Requires a nutritional shift to high-phosphorus feed in late summer and a modest winter rest with reduced watering and slightly cooler nights. Without these cues, flowering may be erratic or absent.

What viguier's angraecum's hardiness rating actually means

Viguier's Angraecum 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 — 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). Viguier's Angraecum has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Viguier's Angraecum hardiness — frequently asked questions

Is viguier's angraecum cold hardy?

Viguier's Angraecum 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. Viguier's Angraecum can only live outside year-round in genuinely frost-free climates (roughly USDA 10–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature viguier's angraecum can survive?

What hardiness zone is viguier's angraecum?

Viguier's Angraecum is rated USDA 10–12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can viguier's angraecum 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 viguier's angraecum 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.