Cold hardiness & minimum temperature

Is Statice sea lavender (Limonium sinuatum)cold hardy? Hardiness zone & min temp

Also called Statice, Sea lavender, Notch-leaf marsh rosemary.

More about statice sea lavender

About Statice sea lavender

Limonium sinuatum · also called Statice, Sea lavender · flowering

Statice is a half-hardy annual producing masses of papery, long-lasting flowers in purple, blue, pink, white, and yellow on winged stems. Both fresh and dried, it is indispensable in cut-flower work. Grow in full sun and well-drained soil; it tolerates coastal exposure and drought. Flowers retain colour for months after cutting and drying.

Cold limit: USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) · RHS H3 (half-hardy; not reliably frost-hardy as a perennial in the UK) (10–28°C (warm-season annual; tolerates brief light frost once established))

Watch for — Powdery mildew (Erysiphe spp.): White powdery coating on leaves and lower stems; most prevalent in late summer as temperatures fluctuate. Improve airflow by spacing plants adequately. Remove affected leaves; apply a sulfur-based fungicide or a bicarbonate spray as a first-line treatment. Avoid overhead irrigation.

What statice sea lavender's hardiness rating actually means

Statice sea lavender is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) — 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 −5 to 1 °C — a light, short frost only. Statice sea lavender shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for statice sea lavender as it gets too cold:

Down to roughly about −5 to 1 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can statice sea lavender go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 statice sea lavender can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline statice sea lavender

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

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Statice sea lavender hardiness — frequently asked questions

Is statice sea lavender cold hardy?

Statice sea lavender is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) (and sheltered UK gardens) statice sea lavender can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature statice sea lavender can survive?

Minimum survivable temperature is roughly about −5 to 1 °C — a light, short frost only. Statice sea lavender shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is statice sea lavender?

Statice sea lavender is rated USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can statice sea lavender survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8–11 (grown as a half-hardy annual in cooler climates; perennial in warm, dry zones) or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect statice sea lavender from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.