Cold hardiness & minimum temperature

Is Yarrow 'Moonshine' (Achillea 'Moonshine')cold hardy? Hardiness zone & min temp

Also called Moonshine yarrow.

More about yarrow 'moonshine'

About Yarrow 'Moonshine'

Achillea 'Moonshine' · also called Moonshine yarrow · flowering

A compact hybrid yarrow grown for flat canary-yellow flower plates held above finely cut, silvery aromatic foliage through summer. 'Moonshine' is exceptionally drought- and heat-tolerant, blooms for weeks, draws pollinators, and makes a fine cut or dried flower. Its tidy silver leaves stay attractive even when not in bloom.

Cold limit: USDA 3-9 · RHS H7 (-34 to 32°C)

Watch for — Root rot: Wet, heavy soil rots the crown, especially in winter; ensure sharp drainage and avoid soggy sites.

What yarrow 'moonshine''s hardiness rating actually means

Yes — yarrow 'moonshine' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 3-9 — 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 below about −20 °C. Yarrow 'Moonshine' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for yarrow 'moonshine' as it gets too cold:

It tolerates winter lows to about −20 °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 yarrow 'moonshine' go outside or overwinter — and where?

Plant it out within USDA 3-9 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 yarrow 'moonshine' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Yarrow 'Moonshine' hardiness — frequently asked questions

Is yarrow 'moonshine' cold hardy?

Yes — yarrow 'moonshine' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Yarrow 'Moonshine' is hardy across USDA 3-9; 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 yarrow 'moonshine' can survive?

Minimum survivable temperature is roughly below about −20 °C. Yarrow 'Moonshine' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is yarrow 'moonshine'?

Yarrow 'Moonshine' is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can yarrow 'moonshine' survive winter outside?

Plant it out within USDA 3-9 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 yarrow 'moonshine' below its minimum temperature?

It tolerates winter lows to about −20 °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.