Cold hardiness & minimum temperature

Is Burgundy Lace Japanese Painted Fern (Athyrium niponicum 'Burgundy Lace')cold hardy? Hardiness zone & min temp

Also called Burgundy Lace Japanese Painted Fern, Burgundy Lace Painted Fern.

More about burgundy lace japanese painted fern

About Burgundy Lace Japanese Painted Fern

Athyrium niponicum 'Burgundy Lace' · also called Burgundy Lace Japanese Painted Fern, Burgundy Lace Painted Fern · houseplant

Burgundy Lace Japanese Painted Fern produces elegantly arching fronds with deep burgundy-purple stems and midribs contrasted by silvery-grey pinnae. Among the most richly colored Athyrium niponicum cultivars. It thrives in shaded, moist conditions and is prized for its ornamental value in woodland-inspired indoor displays and shaded outdoor borders.

Cold limit: USDA 4–9 · RHS H6 (10–22°C)

Watch for — Tip browning from low humidity: When relative humidity falls below 40%, frond tips and edges brown progressively. This is common near heating vents in winter. Increase humidity with a pebble tray and water, move away from heat sources, and avoid misting directly on fronds.

What burgundy lace japanese painted fern's hardiness rating actually means

Yes — burgundy lace japanese painted fern is genuinely cold hardy. Rated RHS H6 and USDA 4–9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4–9 — 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 −20 to −15 °C. Burgundy Lace Japanese Painted Fern is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for burgundy lace japanese painted fern as it gets too cold:

It tolerates winter lows to about −20 to −15 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can burgundy lace japanese painted fern go outside or overwinter — and where?

Plant it out within USDA 4–9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 burgundy lace japanese painted fern can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Burgundy Lace Japanese Painted Fern hardiness — frequently asked questions

Is burgundy lace japanese painted fern cold hardy?

Yes — burgundy lace japanese painted fern is genuinely cold hardy. Rated RHS H6 and USDA 4–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Burgundy Lace Japanese Painted Fern is hardy across USDA 4–9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature burgundy lace japanese painted fern can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Burgundy Lace Japanese Painted Fern is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is burgundy lace japanese painted fern?

Burgundy Lace Japanese Painted Fern is rated USDA 4–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can burgundy lace japanese painted fern survive winter outside?

Plant it out within USDA 4–9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to burgundy lace japanese painted fern below its minimum temperature?

It tolerates winter lows to about −20 to −15 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.