Cold hardiness & minimum temperature

Is Common Sea Lavender (Limonium vulgare)cold hardy? Hardiness zone & min temp

Also called Common sea lavender, Sea lavender, Marsh sea lavender.

More about common sea lavender

About Common Sea Lavender

Limonium vulgare · also called Common sea lavender, Sea lavender · flowering

Limonium vulgare is a native coastal perennial of salt marshes and estuarine mudflats across western and northern Europe, including the British Isles. It produces dense clusters of tiny lavender-purple flowers on branching, wiry stems from July to September, making it a valuable late-summer nectar source. Unlike the garden annual statice, it is fully hardy (RHS H7) and adapted to periodically waterlogged, saline, and sandy coastal soils in full sun. Limonium is listed by the ASPCA as non-toxic to cats and dogs.

Cold limit: USDA 4-9 · RHS H7 (-25°C to 28°C)

What common sea lavender's hardiness rating actually means

Yes — common sea lavender is genuinely cold hardy. Rated RHS H7 and USDA 4-9, 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 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 below about −20 °C. Common Sea Lavender is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for common sea lavender 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 common sea lavender 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 common sea lavender can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Common Sea Lavender hardiness — frequently asked questions

Is common sea lavender cold hardy?

Yes — common sea lavender is genuinely cold hardy. Rated RHS H7 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Common Sea Lavender 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 common sea lavender can survive?

Minimum survivable temperature is roughly below about −20 °C. Common Sea Lavender is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is common sea lavender?

Common Sea Lavender is rated USDA 4-9 and RHS H7 — Hardy in the severest European continental winters.

Can common sea lavender 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 common sea lavender 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.