Cold hardiness & minimum temperature

Is Leucanthemum × superbum 'Becky' (Leucanthemum × superbum 'Becky')cold hardy? Hardiness zone & min temp

Also called Becky Shasta daisy.

More about leucanthemum × superbum 'becky'

About Leucanthemum × superbum 'Becky'

Leucanthemum × superbum 'Becky' · also called Becky Shasta daisy · flowering

Leucanthemum × superbum 'Becky' is a robust, long-flowering Shasta daisy bearing large, classic white daisies with golden centres on strong, self-supporting stems from midsummer into early autumn. Bred for heat and humidity tolerance, it stands without staking and makes an excellent cut flower. It thrives in full sun and ordinary, well-drained garden soil.

Cold limit: USDA 5-9 · RHS H7 (-29-30°C)

Watch for — Crown rot in wet soil: Heavy, waterlogged soil over winter rots the crown. Plant in well-drained ground, avoid mulching directly over the crown, and divide congested clumps to keep them vigorous.

What leucanthemum × superbum 'becky''s hardiness rating actually means

Yes — leucanthemum × superbum 'becky' is genuinely cold hardy. Rated RHS H7 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental 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 below about −20 °C. Leucanthemum × superbum 'Becky' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for leucanthemum × superbum 'becky' as it gets too cold:

It tolerates winter lows to about −20 °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 leucanthemum × superbum 'becky' 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 leucanthemum × superbum 'becky' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Leucanthemum × superbum 'Becky' hardiness — frequently asked questions

Is leucanthemum × superbum 'becky' cold hardy?

Yes — leucanthemum × superbum 'becky' is genuinely cold hardy. Rated RHS H7 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Leucanthemum × superbum 'Becky' 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 leucanthemum × superbum 'becky' can survive?

Minimum survivable temperature is roughly below about −20 °C. Leucanthemum × superbum 'Becky' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is leucanthemum × superbum 'becky'?

Leucanthemum × superbum 'Becky' is rated USDA 5-9 and RHS H7 — Hardy in the severest European continental winters.

Can leucanthemum × superbum 'becky' 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 leucanthemum × superbum 'becky' below its minimum temperature?

It tolerates winter lows to about −20 °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.