Cold hardiness & minimum temperature

Is Becky Shasta daisy (Leucanthemum x superbum 'Becky')cold hardy? Hardiness zone & min temp

Also called Becky Shasta daisy, Shasta daisy 'Becky'.

More about becky shasta daisy

About Becky Shasta daisy

Leucanthemum x superbum 'Becky' · also called Becky Shasta daisy, Shasta daisy 'Becky' · flowering

A tall, exceptionally sturdy Shasta daisy cultivar reaching 90–120 cm with self-supporting stems and large 10 cm white flowers centred in gold, blooming July to September and beyond when deadheaded. A Perennial Plant of the Year selection. Mildly toxic to pets. Excellent back-of-border plant; divide every three to four years.

Cold limit: USDA 5-9 · RHS H5 (-26 to 32°C)

Watch for — Crown rot in wet winters: Poorly drained soils and heavy clay cause crown losses during winter wet. Improve drainage before planting, raise beds if necessary, and avoid mulching directly over the crown.

What becky shasta daisy's hardiness rating actually means

Yes — becky shasta daisy is genuinely cold hardy. Rated RHS H5 and USDA 5-9, 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 5-9 — 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. Becky Shasta daisy is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for becky shasta daisy 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 becky shasta daisy go outside or overwinter — and where?

Plant it out within USDA 5-9 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 becky shasta daisy can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Becky Shasta daisy hardiness — frequently asked questions

Is becky shasta daisy cold hardy?

Yes — becky shasta daisy is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Becky Shasta daisy is hardy across USDA 5-9; 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 becky shasta daisy can survive?

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

What hardiness zone is becky shasta daisy?

Becky Shasta daisy is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can becky shasta daisy survive winter outside?

Plant it out within USDA 5-9 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 becky shasta daisy 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.