Cold hardiness & minimum temperature

Is Hairy Parakohleria (Parakohleria villosa)cold hardy? Hardiness zone & min temp

Also called Hairy Parakohleria.

More about hairy parakohleria

About Hairy Parakohleria

Parakohleria villosa · also called Hairy Parakohleria · tropical

Hairy Parakohleria is a softly hairy-leaved gesneriad from the Andean cloud forests of South America, closely related to Kohleria. It produces attractive, velvety foliage and tubular flowers in warm hues. It thrives with bright filtered light, high humidity, and well-drained soil, and is best grown in a warm greenhouse or humid indoor space.

Cold limit: USDA 10–12 · RHS H1b (16–24°C)

What hairy parakohleria's hardiness rating actually means

Hairy Parakohleria 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). Hairy Parakohleria has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Hairy Parakohleria hardiness — frequently asked questions

Is hairy parakohleria cold hardy?

Hairy Parakohleria 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. Hairy Parakohleria 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 hairy parakohleria can survive?

What hardiness zone is hairy parakohleria?

Hairy Parakohleria 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 hairy parakohleria 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 hairy parakohleria 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.