Cold hardiness & minimum temperature

Is Greater Periwinkle (Vinca major)cold hardy? Hardiness zone & min temp

Also called Greater Periwinkle, Big Periwinkle, Large Periwinkle.

More about greater periwinkle

About Greater Periwinkle

Vinca major · also called Greater Periwinkle, Big Periwinkle · flowering

A vigorous, trailing evergreen groundcover with large glossy leaves and bright violet-blue flowers from spring through early summer. Faster-growing and coarser than lesser periwinkle, it excels in shaded banks, containers, and hanging baskets. Hardy to USDA zone 7 but treated as an annual in colder climates.

Cold limit: USDA 7-11 · RHS H5 (-10°C to 32°C)

What greater periwinkle's hardiness rating actually means

Yes — greater periwinkle is genuinely cold hardy. Rated RHS H5 and USDA 7-11, 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 7-11 — 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. Greater Periwinkle is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for greater periwinkle 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 greater periwinkle go outside or overwinter — and where?

Plant it out within USDA 7-11 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 greater periwinkle can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Frost protection for borderline greater periwinkle

Greater Periwinkle is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Greater Periwinkle hardiness — frequently asked questions

Is greater periwinkle cold hardy?

Yes — greater periwinkle is genuinely cold hardy. Rated RHS H5 and USDA 7-11, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Greater Periwinkle is hardy across USDA 7-11; 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 greater periwinkle can survive?

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

What hardiness zone is greater periwinkle?

Greater Periwinkle is rated USDA 7-11 and RHS H5 — Hardy in most of the UK and in cold winters.

Can greater periwinkle survive winter outside?

Plant it out within USDA 7-11 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.

How do I protect greater periwinkle from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.