Cold hardiness & minimum temperature

Is Chrysanthemum 'Will's Wonderful' (Chrysanthemum 'Will's Wonderful')cold hardy? Hardiness zone & min temp

Also called Will's Wonderful mum, exhibition chrysanthemum, hardy mum.

More about chrysanthemum 'will's wonderful'

About Chrysanthemum 'Will's Wonderful'

Chrysanthemum 'Will's Wonderful' · also called Will's Wonderful mum, exhibition chrysanthemum · flowering

An exhibition-quality chrysanthemum producing large, fully reflexed blooms in warm pink or bronze tones in late autumn. Grown by chrysanthemum enthusiasts for show benches and borders. Toxic to cats, dogs, and horses. Requires disbudding for the largest show blooms and winter frost protection in colder areas.

Cold limit: USDA 5-9 · RHS H5 (5-22°C)

Watch for — Crown rot: Overwinter stools in frost-free, just-moist conditions to prevent rot; restart in fresh compost in spring.

What chrysanthemum 'will's wonderful''s hardiness rating actually means

Yes — chrysanthemum 'will's wonderful' is genuinely cold hardy. Rated RHS H5 and USDA 5-9, 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 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 −15 to −10 °C. Chrysanthemum 'Will's Wonderful' is built for winter — once established it takes hard frost and snow in its stride.

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

Chrysanthemum 'Will's Wonderful' hardiness — frequently asked questions

Is chrysanthemum 'will's wonderful' cold hardy?

Yes — chrysanthemum 'will's wonderful' is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Chrysanthemum 'Will's Wonderful' 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 chrysanthemum 'will's wonderful' can survive?

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

What hardiness zone is chrysanthemum 'will's wonderful'?

Chrysanthemum 'Will's Wonderful' is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can chrysanthemum 'will's wonderful' 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 chrysanthemum 'will's wonderful' 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.