Cold hardiness & minimum temperature

Is Lilium lancifolium (Lilium lancifolium)cold hardy? Hardiness zone & min temp

Also called tiger lily, devil lily, kentan.

More about lilium lancifolium

About Lilium lancifolium

Lilium lancifolium · also called tiger lily, devil lily · flowering

Lilium lancifolium is a robust Asiatic-type lily with recurved orange petals heavily spotted in black and prominent dark bulbils in the leaf axils. It flowers mid-to-late summer on tall stems, naturalises readily in borders, and is grown from scaly bulbs. Vigorous and easy, but every part is severely toxic to cats.

Cold limit: USDA 3-9 · RHS H6 (15-25°C)

Watch for — Bulb rot in wet soil: Poorly drained or waterlogged ground rots the scaly bulbs over winter. Plant on grit, raise beds, and cut back watering after the foliage dies down.

What lilium lancifolium's hardiness rating actually means

Yes — lilium lancifolium is genuinely cold hardy. Rated RHS H6 and USDA 3-9, 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 3-9 — 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. Lilium lancifolium is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for lilium lancifolium 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 lilium lancifolium go outside or overwinter — and where?

Plant it out within USDA 3-9 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 lilium lancifolium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Lilium lancifolium hardiness — frequently asked questions

Is lilium lancifolium cold hardy?

Yes — lilium lancifolium is genuinely cold hardy. Rated RHS H6 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Lilium lancifolium is hardy across USDA 3-9; 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 lilium lancifolium can survive?

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

What hardiness zone is lilium lancifolium?

Lilium lancifolium is rated USDA 3-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can lilium lancifolium survive winter outside?

Plant it out within USDA 3-9 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 lilium lancifolium 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.