Cold hardiness & minimum temperature

Is Scarletta Leucothoe (Leucothoe fontanesiana 'Scarletta')cold hardy? Hardiness zone & min temp

Also called Scarletta leucothoe, Scarletta fetterbush, Scarletta dog hobble.

More about scarletta leucothoe

About Scarletta Leucothoe

Leucothoe fontanesiana 'Scarletta' · also called Scarletta leucothoe, Scarletta fetterbush · flowering

A compact, award-winning cultivar of drooping leucothoe, 'Scarletta' (syn. 'Zeblid') is celebrated for its brilliantly scarlet new foliage in spring, transitioning to deep, shiny green in summer then rich bronze-purple in winter. Denser and more symmetrical than the species, it suits smaller gardens, containers, and mixed borders in dappled shade and acidic soil.

Cold limit: USDA 5–8 · RHS H6 (-20°C to 25°C)

Watch for — Winter desiccation scorch: Exposed, windy sites cause evergreen leaves to lose moisture while frozen roots cannot replace it. Mulch deeply before winter; site in a sheltered, shaded position to reduce cold drying winds.

What scarletta leucothoe's hardiness rating actually means

Yes — scarletta leucothoe is genuinely cold hardy. Rated RHS H6 and USDA 5–8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 5–8 — 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 −20 to −15 °C. Scarletta Leucothoe is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for scarletta leucothoe as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 scarletta leucothoe go outside or overwinter — and where?

Plant it out within USDA 5–8 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 scarletta leucothoe can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Scarletta Leucothoe hardiness — frequently asked questions

Is scarletta leucothoe cold hardy?

Yes — scarletta leucothoe is genuinely cold hardy. Rated RHS H6 and USDA 5–8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Scarletta Leucothoe is hardy across USDA 5–8; 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 scarletta leucothoe can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Scarletta Leucothoe is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is scarletta leucothoe?

Scarletta Leucothoe is rated USDA 5–8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can scarletta leucothoe survive winter outside?

Plant it out within USDA 5–8 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 scarletta leucothoe below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.