Cold hardiness & minimum temperature

Is Broad-Leaved Sea Lavender (Limonium platyphyllum)cold hardy? Hardiness zone & min temp

Also called Broad-leaved sea lavender, Broad-leaved statice, Sea lavender.

More about broad-leaved sea lavender

About Broad-Leaved Sea Lavender

Limonium platyphyllum · also called Broad-leaved sea lavender, Broad-leaved statice · flowering

Limonium platyphyllum is a clump-forming herbaceous perennial native to the grasslands and steppes of southeastern Europe and central Asia. It thrives in full sun with sharply drained, sandy or gritty soil and is highly tolerant of drought, salt spray, and coastal exposure. The most important care rule is never to let the roots sit in waterlogged soil — good drainage is non-negotiable. Limonium is listed as non-toxic to cats and dogs according to the ASPCA.

Cold limit: USDA 3-9 · RHS H7 (-28°C to 35°C)

Watch for — Crown rot: The most common cause of death in heavy or poorly drained soils; roots decay rapidly in wet conditions, especially over winter. Always plant on a slope or raised bed and improve drainage with grit.

What broad-leaved sea lavender's hardiness rating actually means

Yes — broad-leaved sea lavender is genuinely cold hardy. Rated RHS H7 and USDA 3-9, 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 3-9 — 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. Broad-Leaved Sea Lavender is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for broad-leaved 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 broad-leaved sea lavender go outside or overwinter — and where?

Plant it out within USDA 3-9 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 broad-leaved 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.

Broad-Leaved Sea Lavender hardiness — frequently asked questions

Is broad-leaved sea lavender cold hardy?

Yes — broad-leaved sea lavender is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Broad-Leaved Sea Lavender is hardy across USDA 3-9; 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 broad-leaved sea lavender can survive?

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

What hardiness zone is broad-leaved sea lavender?

Broad-Leaved Sea Lavender is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can broad-leaved sea lavender survive winter outside?

Plant it out within USDA 3-9 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 broad-leaved 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.