Cold hardiness & minimum temperature

Is Camellia 'Donation' (Camellia × williamsii 'Donation')cold hardy? Hardiness zone & min temp

Also called Donation camellia.

More about camellia 'donation'

About Camellia 'Donation'

Camellia × williamsii 'Donation' · also called Donation camellia · flowering

'Donation' is one of the most reliable and free-flowering williamsii camellias, smothered in large semi-double orchid-pink blooms in early spring. It is an upright evergreen shrub that, unlike many japonica types, drops spent flowers cleanly. Hardier and more forgiving than C. japonica, it still needs acidic, free-draining soil and dappled shade with steady summer moisture.

Cold limit: USDA 6-9 · RHS H5 (-12 to 30°C)

Watch for — Bud drop: Buds may fall before opening if the roots dry out in late summer or temperatures swing sharply. Water consistently from midsummer onward and mulch to keep the root zone moist.

What camellia 'donation''s hardiness rating actually means

Yes — camellia 'donation' 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. Camellia 'Donation' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for camellia 'donation' 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 camellia 'donation' 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 camellia 'donation' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Camellia 'Donation' hardiness — frequently asked questions

Is camellia 'donation' cold hardy?

Yes — camellia 'donation' 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. Camellia 'Donation' 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 camellia 'donation' can survive?

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

What hardiness zone is camellia 'donation'?

Camellia 'Donation' is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can camellia 'donation' 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 camellia 'donation' 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.