Cold hardiness & minimum temperature

Is Coral Lily (Lilium pumilum)cold hardy? Hardiness zone & min temp

Also called Coral Lily, Dwarf Turk's Cap Lily, Siberian Lily.

More about coral lily

About Coral Lily

Lilium pumilum · also called Coral Lily, Dwarf Turk's Cap Lily · flowering

Coral Lily is a graceful, compact species from Siberia, Mongolia, and northern China, bearing up to 30 brilliant scarlet to coral-red, pendant turk's-cap flowers on slender stems in early summer. One of the earliest lilies to bloom, it is short-lived (3–5 years) but self-seeds freely. Ideal for rock gardens and front-of-border. Severely toxic to cats.

Cold limit: USDA 3–8 · RHS H7 (−20–25°C)

What coral lily's hardiness rating actually means

Yes — coral lily 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. Coral Lily is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for coral lily 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 coral lily 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 coral lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Coral Lily hardiness — frequently asked questions

Is coral lily cold hardy?

Yes — coral lily 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. Coral Lily 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 coral lily can survive?

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

What hardiness zone is coral lily?

Coral Lily is rated USDA 3–8 and RHS H7 — Hardy in the severest European continental winters.

Can coral lily 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 coral lily 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.