Cold hardiness & minimum temperature

Is Milkflower cotoneaster (Cotoneaster lacteus)cold hardy? Hardiness zone & min temp

Also called milkflower cotoneaster, late cotoneaster, Parney cotoneaster.

More about milkflower cotoneaster

About Milkflower cotoneaster

Cotoneaster lacteus · also called milkflower cotoneaster, late cotoneaster · flowering

Milkflower cotoneaster is a large, semi-evergreen to evergreen arching shrub bearing clusters of creamy-white flowers in early summer and exceptionally long-lasting clusters of red berries from autumn through to late winter. It is one of the latest-fruiting cotoneasters, providing valuable winter food for birds. Tough, adaptable, and low-maintenance once established.

Cold limit: USDA 6–9 · RHS H5 (-15 to 35°C)

What milkflower cotoneaster's hardiness rating actually means

Yes — milkflower cotoneaster is genuinely cold hardy. Rated RHS H5 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 6–9 — 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 −15 to −10 °C. Milkflower cotoneaster is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for milkflower cotoneaster as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 milkflower cotoneaster go outside or overwinter — and where?

Plant it out within USDA 6–9 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 milkflower cotoneaster can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Milkflower cotoneaster hardiness — frequently asked questions

Is milkflower cotoneaster cold hardy?

Yes — milkflower cotoneaster is genuinely cold hardy. Rated RHS H5 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Milkflower cotoneaster is hardy across USDA 6–9; 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 milkflower cotoneaster can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Milkflower cotoneaster is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is milkflower cotoneaster?

Milkflower cotoneaster is rated USDA 6–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can milkflower cotoneaster survive winter outside?

Plant it out within USDA 6–9 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 milkflower cotoneaster below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.