Cold hardiness & minimum temperature

Is Friedrichsthals Copper Leaf (Chrysothemis friedrichsthaliana)cold hardy? Hardiness zone & min temp

Also called Friedrichsthals Copper Leaf, Friedrichsthal's Chrysothemis.

More about friedrichsthals copper leaf

About Friedrichsthals Copper Leaf

Chrysothemis friedrichsthaliana · also called Friedrichsthals Copper Leaf, Friedrichsthal's Chrysothemis · tropical

Chrysothemis friedrichsthaliana is a tuberous gesneriad native to Central America, closely related to C. pulchella but with slightly broader leaves and similarly vibrant orange-yellow flowers. It requires warm, humid conditions and a winter dry rest. An uncommon collector's plant ideal for vivaria, terraria, or heated greenhouses.

Cold limit: USDA 11–12 · RHS H1a (18–28°C)

Watch for — Poor flowering: Insufficient light is the most common cause. Ensure the plant receives several hours of bright indirect light daily. Inadequate dormancy in winter can also reduce the following season's bloom.

What friedrichsthals copper leaf's hardiness rating actually means

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

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

Friedrichsthals Copper Leaf hardiness — frequently asked questions

Is friedrichsthals copper leaf cold hardy?

Friedrichsthals Copper Leaf 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. Friedrichsthals Copper Leaf 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 friedrichsthals copper leaf can survive?

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

What hardiness zone is friedrichsthals copper leaf?

Friedrichsthals Copper Leaf is rated USDA 11–12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can friedrichsthals copper leaf 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 friedrichsthals copper leaf 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.