Cold hardiness & minimum temperature

Is Anubias congensis (Anubias congensis)cold hardy? Hardiness zone & min temp

Also called Congo Anubias, lance-leaf Anubias.

More about anubias congensis

About Anubias congensis

Anubias congensis · also called Congo Anubias, lance-leaf Anubias · tropical

Anubias congensis is a robust West and Central African aquatic aroid with elongated, slightly wavy lance-shaped leaves on a thick creeping rhizome. Larger than nana forms, it makes a striking mid-ground or background specimen attached to wood. Like all Anubias it is slow, hardy, low-light tolerant and feeds chiefly from the water column.

Cold limit: USDA 11-12 (true tropical; aquarium/indoor only) · RHS H1a (22-28°C)

What anubias congensis's hardiness rating actually means

Anubias congensis 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 (true tropical; aquarium/indoor only) — 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). Anubias congensis has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for anubias congensis 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 anubias congensis 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 anubias congensis can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Anubias congensis hardiness — frequently asked questions

Is anubias congensis cold hardy?

Anubias congensis 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. Anubias congensis can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (true tropical; aquarium/indoor only)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature anubias congensis can survive?

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

What hardiness zone is anubias congensis?

Anubias congensis is rated USDA 11-12 (true tropical; aquarium/indoor only) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can anubias congensis 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 anubias congensis 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.