Cold hardiness & minimum temperature

Is Drooping Star of Bethlehem (Ornithogalum nutans)cold hardy? Hardiness zone & min temp

Also called Drooping star of Bethlehem, Nodding star of Bethlehem, Silver bells.

More about drooping star of bethlehem

About Drooping Star of Bethlehem

Ornithogalum nutans · also called Drooping star of Bethlehem, Nodding star of Bethlehem · flowering

Ornithogalum nutans is a spring-flowering bulb native to south-east Europe and western Asia, widely naturalised across temperate gardens and sometimes considered a weed where it spreads vigorously. It bears elegant, nodding racemes of silvery-white, bell-shaped flowers with distinctive green stripes on the outer petals, held on stems above narrow, channelled grey-green leaves. It is one of the easiest and most tolerant garden bulbs, naturalising freely in grass, borders, and light shade with virtually no care required; the key point is that it spreads prolifically by offsets and self-seeding, so site it where it can spread freely. All Ornithogalum species are toxic to cats and dogs.

Cold limit: USDA 4-9 · RHS H6 (-20 to 22°C)

What drooping star of bethlehem's hardiness rating actually means

Yes — drooping star of bethlehem is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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. Drooping Star of Bethlehem is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for drooping star of bethlehem 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 drooping star of bethlehem go outside or overwinter — and where?

Plant it out within USDA 4-9 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 drooping star of bethlehem can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Drooping Star of Bethlehem hardiness — frequently asked questions

Is drooping star of bethlehem cold hardy?

Yes — drooping star of bethlehem is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Drooping Star of Bethlehem is hardy across USDA 4-9; 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 drooping star of bethlehem can survive?

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

What hardiness zone is drooping star of bethlehem?

Drooping Star of Bethlehem is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can drooping star of bethlehem survive winter outside?

Plant it out within USDA 4-9 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 drooping star of bethlehem 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.