Cold hardiness & minimum temperature

Is Coreopsis 'Limerock Ruby' (Coreopsis 'Limerock Ruby')cold hardy? Hardiness zone & min temp

Also called Limerock Ruby Tickseed, Ruby Coreopsis.

More about coreopsis 'limerock ruby'

About Coreopsis 'Limerock Ruby'

Coreopsis 'Limerock Ruby' · also called Limerock Ruby Tickseed, Ruby Coreopsis · flowering

Coreopsis 'Limerock Ruby' is a compact perennial tickseed producing an abundance of rich ruby-red to deep-pink daisy flowers over feathery, fine-textured foliage from summer into autumn. It is heat- and drought-tolerant once established, thriving in full sun and well-drained conditions. Coreopsis is non-toxic to pets per the ASPCA.

Cold limit: USDA 5-9 · RHS H5 (-10-32°C)

Watch for — Short-lived in cold climates: May not be reliably hardy below Zone 5. Mulch crowns in autumn to improve winter survival.

What coreopsis 'limerock ruby''s hardiness rating actually means

Yes — coreopsis 'limerock ruby' 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. Coreopsis 'Limerock Ruby' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for coreopsis 'limerock ruby' 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 coreopsis 'limerock ruby' 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 coreopsis 'limerock ruby' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Coreopsis 'Limerock Ruby' hardiness — frequently asked questions

Is coreopsis 'limerock ruby' cold hardy?

Yes — coreopsis 'limerock ruby' 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. Coreopsis 'Limerock Ruby' 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 coreopsis 'limerock ruby' can survive?

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

What hardiness zone is coreopsis 'limerock ruby'?

Coreopsis 'Limerock Ruby' is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can coreopsis 'limerock ruby' 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 coreopsis 'limerock ruby' 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.