Cold hardiness & minimum temperature

Is Woolly Lavender (Lavandula lanata)cold hardy? Hardiness zone & min temp

Also called Woolly lavender, White-woolly lavender.

More about woolly lavender

About Woolly Lavender

Lavandula lanata · also called Woolly lavender, White-woolly lavender · herb

A distinctive Spanish mountain lavender with conspicuously white-woolly stems and broad silver-white leaves that give the plant a striking textural appearance unlike any other lavender. It produces long, slender spikes of deep violet-purple, strongly fragrant flowers in summer and is moderately cold-hardy for a Mediterranean species. Sharp drainage and full sun are non-negotiable; this species comes from high-altitude, dry limestone habitats in southern Spain. Lavender is toxic to cats, dogs, and horses according to the ASPCA.

Cold limit: USDA 7-9 · RHS H4 (-10°C to 38°C)

Watch for — Root and crown rot in wet winters: The primary cause of loss in UK gardens; sitting water at the crown during cold spells kills quickly. Grow in raised beds or containers with extra grit, and shelter from prolonged winter rain.

What woolly lavender's hardiness rating actually means

Yes — woolly lavender is genuinely cold hardy. Rated RHS H4 and USDA 7-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 7-9 — 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 about −10 to −5 °C. Woolly Lavender is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for woolly lavender as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 woolly lavender go outside or overwinter — and where?

Plant it out within USDA 7-9 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 woolly lavender can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline woolly lavender

Woolly Lavender 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.

Woolly Lavender hardiness — frequently asked questions

Is woolly lavender cold hardy?

Yes — woolly lavender is genuinely cold hardy. Rated RHS H4 and USDA 7-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Woolly Lavender is hardy across USDA 7-9; 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 woolly lavender can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Woolly Lavender is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is woolly lavender?

Woolly Lavender is rated USDA 7-9 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can woolly lavender survive winter outside?

Plant it out within USDA 7-9 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.

How do I protect woolly lavender 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.