Cold hardiness & minimum temperature

Is Queen of Night Tulip (Tulipa gesneriana 'Queen of Night')cold hardy? Hardiness zone & min temp

Also called Queen of Night Tulip, Black Tulip.

More about queen of night tulip

About Queen of Night Tulip

Tulipa gesneriana 'Queen of Night' · also called Queen of Night Tulip, Black Tulip · flowering

Tulipa 'Queen of Night' is an iconic late-season single late tulip bearing deep maroon-black, satiny flowers on tall 60 cm stems in mid-to-late spring. One of the darkest tulips available, it makes a dramatic statement in borders and cut-flower arrangements. Best treated as an annual in UK gardens; requires cold vernalisation for reliable bloom.

Cold limit: USDA 3–8 · RHS H6 (-15°C to 18°C (optimal spring growth: 8–15°C))

What queen of night tulip's hardiness rating actually means

Yes — queen of night tulip 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. Queen of Night Tulip is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for queen of night tulip 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 queen of night tulip 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 queen of night tulip can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Queen of Night Tulip hardiness — frequently asked questions

Is queen of night tulip cold hardy?

Yes — queen of night tulip 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. Queen of Night Tulip 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 queen of night tulip can survive?

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

What hardiness zone is queen of night tulip?

Queen of Night Tulip is rated USDA 3–8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can queen of night tulip 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 queen of night tulip 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.