Cold hardiness & minimum temperature

Is Worplesdon Sweetgum (Liquidambar styraciflua 'Worplesdon')cold hardy? Hardiness zone & min temp

Also called Worplesdon Sweetgum, Worplesdon Sweet Gum.

More about worplesdon sweetgum

About Worplesdon Sweetgum

Liquidambar styraciflua 'Worplesdon' · also called Worplesdon Sweetgum, Worplesdon Sweet Gum · flowering

An RHS Award of Garden Merit cultivar of American sweetgum grown for its spectacular multi-coloured autumn display of red, orange, yellow, and purple. Broadly rounded with deeply lobed glossy foliage. Best in lime-free, moist well-drained soil in full sun. Long-lived and eventually large, it rewards patience with outstanding seasonal interest.

Cold limit: USDA 5–9 · RHS H6 (-25°C to 38°C)

Watch for — Autumn colour variability: Colour intensity depends on temperature differential between day and night in autumn. Warm autumns or sheltered urban sites can produce less vivid displays. 'Worplesdon' is more consistent than the straight species but variation still occurs seasonally.

What worplesdon sweetgum's hardiness rating actually means

Yes — worplesdon sweetgum is genuinely cold hardy. Rated RHS H6 and USDA 5–9, 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 5–9 — 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 −20 to −15 °C. Worplesdon Sweetgum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for worplesdon sweetgum 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 worplesdon sweetgum go outside or overwinter — and where?

Plant it out within USDA 5–9 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 worplesdon sweetgum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Worplesdon Sweetgum hardiness — frequently asked questions

Is worplesdon sweetgum cold hardy?

Yes — worplesdon sweetgum is genuinely cold hardy. Rated RHS H6 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Worplesdon Sweetgum is hardy across USDA 5–9; 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 worplesdon sweetgum can survive?

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

What hardiness zone is worplesdon sweetgum?

Worplesdon Sweetgum is rated USDA 5–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can worplesdon sweetgum survive winter outside?

Plant it out within USDA 5–9 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 worplesdon sweetgum 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.