Cold hardiness & minimum temperature

Is Cryptocoryne wendtii 'Brown' (Cryptocoryne wendtii 'Brown')cold hardy? Hardiness zone & min temp

Also called brown Wendt's Crypt, wendtii brown.

More about cryptocoryne wendtii 'brown'

About Cryptocoryne wendtii 'Brown'

Cryptocoryne wendtii 'Brown' · also called brown Wendt's Crypt, wendtii brown · tropical

Cryptocoryne wendtii 'Brown' is a hardy Sri Lankan aquarium aroid with bronze-brown, lance-shaped leaves that form a dense 10-20 cm midground rosette. Grown fully submerged in tropical freshwater tanks, it tolerates low light and most water chemistries, making it one of the most forgiving Crypts for planted-aquarium beginners once it settles in.

Cold limit: USDA Not applicable (tropical submerged aquatic; aquarium plant in all US zones) · RHS H1a (22-28°C)

What cryptocoryne wendtii 'brown''s hardiness rating actually means

Cryptocoryne wendtii 'Brown' 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 Not applicable (tropical submerged aquatic; aquarium plant in all US zones) — 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). Cryptocoryne wendtii 'Brown' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Cryptocoryne wendtii 'Brown' hardiness — frequently asked questions

Is cryptocoryne wendtii 'brown' cold hardy?

Cryptocoryne wendtii 'Brown' 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. Cryptocoryne wendtii 'Brown' can only live outside year-round in genuinely frost-free climates (roughly USDA Not applicable (tropical submerged aquatic; aquarium plant in all US zones)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature cryptocoryne wendtii 'brown' can survive?

What hardiness zone is cryptocoryne wendtii 'brown'?

Cryptocoryne wendtii 'Brown' is rated USDA Not applicable (tropical submerged aquatic; aquarium plant in all US zones) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can cryptocoryne wendtii 'brown' 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 cryptocoryne wendtii 'brown' 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.