Cold hardiness & minimum temperature

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

Also called Lime Rickey coral bells, lime-green heuchera.

More about lime rickey heuchera

About Lime Rickey Heuchera

Heuchera 'Lime Rickey' · also called Lime Rickey coral bells, lime-green heuchera · flowering

'Lime Rickey' is a vivid coral bells with rounded, ruffled chartreuse-to-lime foliage that emerges almost yellow and matures to bright green, lighting up shady corners. Short stems bear pure white flowers in late spring. A small evergreen mound, it pairs beautifully with dark-leaved plants and shines in containers and shade-border front rows.

Cold limit: USDA 4-9 · RHS H6 (-29 to 30°C)

Watch for — Crown heaving: Winter freeze-thaw lifts the crown and exposes roots. Mulch for winter and replant heaved crowns each spring.

What lime rickey heuchera's hardiness rating actually means

Yes — lime rickey heuchera 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. Lime Rickey Heuchera is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for lime rickey heuchera 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 lime rickey heuchera 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 lime rickey heuchera can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Lime Rickey Heuchera hardiness — frequently asked questions

Is lime rickey heuchera cold hardy?

Yes — lime rickey heuchera 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. Lime Rickey Heuchera 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 lime rickey heuchera can survive?

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

What hardiness zone is lime rickey heuchera?

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

Can lime rickey heuchera 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 lime rickey heuchera 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.