Cold hardiness & minimum temperature

Is Sharp-lobed Hepatica (Hepatica acutiloba)cold hardy? Hardiness zone & min temp

Also called Sharp-lobed Hepatica, Sharp-lobed Liverleaf.

More about sharp-lobed hepatica

About Sharp-lobed Hepatica

Hepatica acutiloba · also called Sharp-lobed Hepatica, Sharp-lobed Liverleaf · flowering

Sharp-lobed Hepatica is a North American woodland native distinguished by its three pointed leaf lobes, differing from the rounded lobes of H. americana. It blooms in very early spring with white, pink, or lavender flowers and naturally colonises calcium-rich woodland soils. Exceptionally cold-hardy and suited to naturalising in shaded gardens.

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

Watch for — Slug damage: Young spring foliage and flower stems are vulnerable. Use organic iron phosphate pellets in early spring and remove debris where slugs overwinter.

What sharp-lobed hepatica's hardiness rating actually means

Yes — sharp-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. Sharp-lobed Hepatica is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sharp-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 sharp-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 sharp-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.

Sharp-lobed Hepatica hardiness — frequently asked questions

Is sharp-lobed hepatica cold hardy?

Yes — sharp-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. Sharp-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 sharp-lobed hepatica can survive?

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

What hardiness zone is sharp-lobed hepatica?

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

Can sharp-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 sharp-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.