Cold hardiness & minimum temperature

Is Large-Leaved Drymonia (Drymonia macrophylla)cold hardy? Hardiness zone & min temp

Also called Large-Leaved Drymonia, Large-Leaf Drymonia.

More about large-leaved drymonia

About Large-Leaved Drymonia

Drymonia macrophylla · also called Large-Leaved Drymonia, Large-Leaf Drymonia · tropical

Drymonia macrophylla is a robust, epiphytic gesneriad from Central and South American cloud forests, admired for its large, quilted leaves and hooded tubular flowers with fringed white petals and purple markings. It performs best in warm, very humid terrarium or greenhouse conditions, where its trailing or scrambling stems can spread freely.

Cold limit: USDA 11–12 · RHS H1a (18–26°C)

What large-leaved drymonia's hardiness rating actually means

Large-Leaved Drymonia 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 — 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). Large-Leaved Drymonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Large-Leaved Drymonia hardiness — frequently asked questions

Is large-leaved drymonia cold hardy?

Large-Leaved Drymonia 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. Large-Leaved Drymonia can only live outside year-round in genuinely frost-free climates (roughly USDA 11–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature large-leaved drymonia can survive?

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

What hardiness zone is large-leaved drymonia?

Large-Leaved Drymonia is rated USDA 11–12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can large-leaved drymonia 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 large-leaved drymonia 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.