Cold hardiness & minimum temperature

Is Fama White scabiosa (Scabiosa caucasica 'Fama White')cold hardy? Hardiness zone & min temp

Also called Fama White scabiosa, Caucasian pincushion flower, pincushion flower.

More about fama white scabiosa

About Fama White scabiosa

Scabiosa caucasica 'Fama White' · also called Fama White scabiosa, Caucasian pincushion flower · flowering

Fama White scabiosa is a clump-forming perennial producing large, pure white pincushion flowers on long, straight stems from early to late summer, making it superb for cutting. An RHS Award of Garden Merit cultivar, it prefers alkaline, sharply drained soil, full sun, and resents winter wet — a reliable cottage-border classic.

Cold limit: USDA 4–9 · RHS H5 (-10–25°C)

Watch for — Winter crown rot: The most common cause of plant loss: standing water around the crown during cold wet winters kills the plant. Improve drainage before planting; avoid heavy mulches that sit against the stem; consider growing in raised beds or on sloping ground.

What fama white scabiosa's hardiness rating actually means

Yes — fama white scabiosa is genuinely cold hardy. Rated RHS H5 and USDA 4–9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. 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 −15 to −10 °C. Fama White scabiosa is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for fama white scabiosa as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 fama white scabiosa 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 fama white scabiosa can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Fama White scabiosa hardiness — frequently asked questions

Is fama white scabiosa cold hardy?

Yes — fama white scabiosa is genuinely cold hardy. Rated RHS H5 and USDA 4–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Fama White scabiosa 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 fama white scabiosa can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Fama White scabiosa is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is fama white scabiosa?

Fama White scabiosa is rated USDA 4–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can fama white scabiosa 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 fama white scabiosa below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.