Cold hardiness & minimum temperature

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

Also called Queen of Night tulip, black tulip, dark maroon tulip.

More about tulipa 'queen of night'

About Tulipa 'Queen of Night'

Tulipa 'Queen of Night' · also called Queen of Night tulip, black tulip · flowering

'Queen of Night' is a Single Late tulip celebrated as the classic 'black tulip', its deep velvety maroon-purple cups so dark they appear near-black. A spring-flowering bulb, it blooms mid-to-late season on tall stems. Plant bulbs in autumn in full sun and free-draining soil; it naturalises poorly, so treat as short-lived and replant for reliable display.

Cold limit: USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10) · RHS H6 (Needs winter chill below 10°C; blooms 10-18°C)

What tulipa 'queen of night''s hardiness rating actually means

Yes — tulipa 'queen of night' is genuinely cold hardy. Rated RHS H6 and USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10), 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 (needs winter chilling; pre-chill bulbs in zones 9-10) — 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. Tulipa 'Queen of Night' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for tulipa 'queen of night' 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 tulipa 'queen of night' go outside or overwinter — and where?

Plant it out within USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10) 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 tulipa 'queen of night' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Tulipa 'Queen of Night' hardiness — frequently asked questions

Is tulipa 'queen of night' cold hardy?

Yes — tulipa 'queen of night' is genuinely cold hardy. Rated RHS H6 and USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Tulipa 'Queen of Night' is hardy across USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10); 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 tulipa 'queen of night' can survive?

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

What hardiness zone is tulipa 'queen of night'?

Tulipa 'Queen of Night' is rated USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10) and RHS H6 — Hardy throughout the UK and northern Europe.

Can tulipa 'queen of night' survive winter outside?

Plant it out within USDA 3-8 (needs winter chilling; pre-chill bulbs in zones 9-10) 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 tulipa 'queen of night' 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.