Cold hardiness & minimum temperature

Is Chinese Windmill Palm 'Bulgaria' (Trachycarpus fortunei 'Bulgaria')cold hardy? Hardiness zone & min temp

Also called Bulgarian Windmill Palm.

More about chinese windmill palm 'bulgaria'

About Chinese Windmill Palm 'Bulgaria'

Trachycarpus fortunei 'Bulgaria' · also called Bulgarian Windmill Palm · tropical

The 'Bulgaria' windmill palm is a cold-hardy selection of Trachycarpus fortunei raised from exceptionally tough Bulgarian seed stock. It carries fan-shaped fronds on a slender, fibre-clad trunk and tolerates frost, snow and wind far better than most palms, making it a favourite for temperate gardens across the US and UK.

Cold limit: USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C) · RHS H5 (-12 to 30°C)

Watch for — Winter root rot: Cold combined with waterlogged soil kills more windmill palms than frost. Plant in sharply drained ground and keep containers from sitting in saucers of water.

What chinese windmill palm 'bulgaria''s hardiness rating actually means

Yes — chinese windmill palm 'bulgaria' is genuinely cold hardy. Rated RHS H5 and USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C), 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 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C) — 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. Chinese Windmill Palm 'Bulgaria' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for chinese windmill palm 'bulgaria' 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 chinese windmill palm 'bulgaria' go outside or overwinter — and where?

Plant it out within USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C) 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 chinese windmill palm 'bulgaria' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Chinese Windmill Palm 'Bulgaria' hardiness — frequently asked questions

Is chinese windmill palm 'bulgaria' cold hardy?

Yes — chinese windmill palm 'bulgaria' is genuinely cold hardy. Rated RHS H5 and USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Chinese Windmill Palm 'Bulgaria' is hardy across USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C); 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 chinese windmill palm 'bulgaria' can survive?

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

What hardiness zone is chinese windmill palm 'bulgaria'?

Chinese Windmill Palm 'Bulgaria' is rated USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C) and RHS H5 — Hardy in most of the UK and in cold winters.

Can chinese windmill palm 'bulgaria' survive winter outside?

Plant it out within USDA 7b-11 (one of the hardiest palms; established plants survive brief dips to about -12 to -15°C) 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 chinese windmill palm 'bulgaria' 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.