Cold hardiness & minimum temperature

Is Tenby Daffodil (Narcissus obvallaris)cold hardy? Hardiness zone & min temp

Also called Tenby Daffodil, St David's Daffodil.

More about tenby daffodil

About Tenby Daffodil

Narcissus obvallaris · also called Tenby Daffodil, St David's Daffodil · flowering

The Tenby Daffodil is a compact, early-blooming wild daffodil naturalised in Pembrokeshire, Wales, bearing solitary rich-golden flowers with a wide trumpet on slender stems in early spring. It is one of the UK's rarest native flowers. All Narcissus parts are toxic to pets and people; contains lycorine and alkaloids.

Cold limit: USDA 4-8 · RHS H6 (2-18°C)

What tenby daffodil's hardiness rating actually means

Yes — tenby daffodil is genuinely cold hardy. Rated RHS H6 and USDA 4-8, 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 4-8 — 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. Tenby Daffodil is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for tenby daffodil 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 tenby daffodil go outside or overwinter — and where?

Plant it out within USDA 4-8 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 tenby daffodil can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Tenby Daffodil hardiness — frequently asked questions

Is tenby daffodil cold hardy?

Yes — tenby daffodil is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Tenby Daffodil is hardy across USDA 4-8; 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 tenby daffodil can survive?

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

What hardiness zone is tenby daffodil?

Tenby Daffodil is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can tenby daffodil survive winter outside?

Plant it out within USDA 4-8 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 tenby daffodil 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.