Cold hardiness & minimum temperature

Is Chaytor's Lavender (Lavandula x chaytorae)cold hardy? Hardiness zone & min temp

Also called Chaytor's lavender, Silver lavender, Woolly hybrid lavender.

More about chaytor's lavender

About Chaytor's Lavender

Lavandula x chaytorae · also called Chaytor's lavender, Silver lavender · herb

Chaytor's lavender is a garden hybrid between Lavandula angustifolia (English lavender) and L. lanata (woolly lavender), first raised in England in the 1980s and named in honour of Kew botanist Dorothy Chaytor, who authored a landmark 1937 lavender monograph. It inherits the cold hardiness of L. angustifolia and the striking silvery-white, densely woolly foliage of L. lanata, producing long-stemmed, fragrant violet-blue flower spikes in summer; it is one of the hardier of the non-angustifolia hybrids and performs well across most of the UK in free-draining soil. The most important care requirement is excellent drainage, particularly in winter, as the woolly L. lanata parentage makes stems susceptible to rotting in prolonged wet conditions. According to the ASPCA, lavender (Lavandula) is toxic to cats, dogs, and horses.

Cold limit: USDA 7-9 · RHS H4 (-10 to 35°C)

Watch for — Winter stem rot: The woolly stems inherited from the L. lanata parent are prone to rotting at the base when wet and cold simultaneously; avoid autumn pruning in exposed locations, dress around the crown with horticultural grit, and ensure no waterlogging occurs near the root zone from October to March.

What chaytor's lavender's hardiness rating actually means

Yes — chaytor's 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. Chaytor's Lavender is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for chaytor's 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 chaytor's 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 chaytor's 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 chaytor's lavender

Chaytor's 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.

Chaytor's Lavender hardiness — frequently asked questions

Is chaytor's lavender cold hardy?

Yes — chaytor's 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. Chaytor's 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 chaytor's lavender can survive?

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

What hardiness zone is chaytor's lavender?

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

Can chaytor's 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 chaytor's 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.