Cold hardiness & minimum temperature

Is Turk's Cap Lily (Lilium martagon)cold hardy? Hardiness zone & min temp

Also called Martagon Lily, Common Turk's Cap, European Turk's Cap Lily.

More about turk's cap lily

About Turk's Cap Lily

Lilium martagon · also called Martagon Lily, Common Turk's Cap · flowering

Lilium martagon is a classic woodland lily native across Eurasia, bearing whorled leaves and nodding, reflexed pink-purple spotted flowers in midsummer. One of the most reliable and long-lived lilies for UK gardens, naturalising freely under deciduous trees. DEADLY TOXIC to cats — even tiny amounts of pollen or water from the vase can cause fatal kidney failure.

Cold limit: USDA 3–8 · RHS H6 (−20–25°C)

What turk's cap lily's hardiness rating actually means

Yes — turk's cap lily is genuinely cold hardy. Rated RHS H6 and USDA 3–8, 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 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 about −20 to −15 °C. Turk's Cap Lily is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for turk's cap lily 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 turk's cap 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 turk's cap lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Turk's Cap Lily hardiness — frequently asked questions

Is turk's cap lily cold hardy?

Yes — turk's cap lily is genuinely cold hardy. Rated RHS H6 and USDA 3–8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Turk's Cap 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 turk's cap lily can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Turk's Cap Lily is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is turk's cap lily?

Turk's Cap Lily is rated USDA 3–8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can turk's cap 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 turk's cap lily 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.