Cold hardiness & minimum temperature

Is Round-lobed Hepatica (Hepatica americana)cold hardy? Hardiness zone & min temp

Also called Round-lobed Hepatica, Round-lobed Liverleaf, American Hepatica.

More about round-lobed hepatica

About Round-lobed Hepatica

Hepatica americana · also called Round-lobed Hepatica, Round-lobed Liverleaf · flowering

Round-lobed Hepatica is a native North American woodland wildflower producing lavender-blue to white blooms in early spring, often while snow still lingers. Distinguished by its three rounded leaf lobes, it naturalises beautifully under deciduous trees in acidic woodland settings. Slow-growing but very long-lived and cold-hardy.

Cold limit: USDA 3–8 · RHS H7 (-30 to 22°C)

What round-lobed hepatica's hardiness rating actually means

Yes — round-lobed hepatica is genuinely cold hardy. Rated RHS H7 and USDA 3–8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 3–8 — 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 below about −20 °C. Round-lobed Hepatica is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for round-lobed hepatica as it gets too cold:

It tolerates winter lows to about −20 °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 round-lobed hepatica go outside or overwinter — and where?

Plant it out within USDA 3–8 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 round-lobed hepatica can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Round-lobed Hepatica hardiness — frequently asked questions

Is round-lobed hepatica cold hardy?

Yes — round-lobed hepatica is genuinely cold hardy. Rated RHS H7 and USDA 3–8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Round-lobed Hepatica is hardy across USDA 3–8; 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 round-lobed hepatica can survive?

Minimum survivable temperature is roughly below about −20 °C. Round-lobed Hepatica is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is round-lobed hepatica?

Round-lobed Hepatica is rated USDA 3–8 and RHS H7 — Hardy in the severest European continental winters.

Can round-lobed hepatica survive winter outside?

Plant it out within USDA 3–8 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 round-lobed hepatica below its minimum temperature?

It tolerates winter lows to about −20 °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.