Cold hardiness & minimum temperature

Is Henry's Lily (Lilium henryi)cold hardy? Hardiness zone & min temp

Also called Henry Lily, Tiger Lily (Chinese), Orange Turk's Cap.

More about henry's lily

About Henry's Lily

Lilium henryi · also called Henry Lily, Tiger Lily (Chinese) · flowering

Lilium henryi is a vigorous tall lily from central China producing arching stems bearing up to 20 reflexed, deep apricot-orange flowers with prominent papillae in midsummer. One of the most tolerant lilies, accepting chalky soils and partial shade. Excellent naturaliser. DEADLY TOXIC to cats; all parts can cause fatal kidney failure.

Cold limit: USDA 3–9 · RHS H6 (−20–28°C)

Watch for — Overwintering bulb rot: Rarely a problem in well-drained soils, but in very heavy clay a deep gravel layer under the bulb at planting time provides insurance.

What henry's lily's hardiness rating actually means

Yes — henry's lily 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. Henry's Lily is built for winter — once established it takes hard frost and snow in its stride.

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

Henry's Lily hardiness — frequently asked questions

Is henry's lily cold hardy?

Yes — henry's lily 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. Henry's Lily 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 henry's lily can survive?

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

What hardiness zone is henry's lily?

Henry's Lily is rated USDA 3–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can henry's lily 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 henry's 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.