Cold hardiness & minimum temperature

Is Coral Bells 'Lime Rickey' (Heuchera 'Lime Rickey')cold hardy? Hardiness zone & min temp

Also called Lime Rickey Coral Bells, Ruffled Coral Bells, Alumroot.

More about coral bells 'lime rickey'

About Coral Bells 'Lime Rickey'

Heuchera 'Lime Rickey' · also called Lime Rickey Coral Bells, Ruffled Coral Bells · flowering

Heuchera 'Lime Rickey' is a ruffled-leaved coral bells cultivar displaying fresh, bright lime-green foliage that lightens to almost white in spots. Lacy white flowers bloom in late spring to early summer on slender stems. It brightens shaded spots and container arrangements effectively. Considered non-toxic to pets based on ASPCA Heuchera guidance.

Cold limit: USDA 4-9 · RHS H6 (-15-28°C)

What coral bells 'lime rickey''s hardiness rating actually means

Yes — coral bells 'lime rickey' is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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. Coral Bells 'Lime Rickey' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for coral bells 'lime rickey' 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 coral bells 'lime rickey' go outside or overwinter — and where?

Plant it out within USDA 4-9 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 coral bells 'lime rickey' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Coral Bells 'Lime Rickey' hardiness — frequently asked questions

Is coral bells 'lime rickey' cold hardy?

Yes — coral bells 'lime rickey' is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Coral Bells 'Lime Rickey' is hardy across USDA 4-9; 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 coral bells 'lime rickey' can survive?

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

What hardiness zone is coral bells 'lime rickey'?

Coral Bells 'Lime Rickey' is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can coral bells 'lime rickey' survive winter outside?

Plant it out within USDA 4-9 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 coral bells 'lime rickey' 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.