Cold hardiness & minimum temperature

Is Purple-leafed Clover (Trifolium repens 'Atropurpureum')cold hardy? Hardiness zone & min temp

Also called Purple-leafed Clover, Black-leaved Clover, Chocolate Clover.

More about purple-leafed clover

About Purple-leafed Clover

Trifolium repens 'Atropurpureum' · also called Purple-leafed Clover, Black-leaved Clover · edible

Purple-leafed Clover is an ornamental selection of white clover with striking chocolate-purple leaves edged in bright green. White to cream flowers appear in summer on long stalks. Young leaves and flowers are edible. It makes a colourful, low-maintenance groundcover or lawn substitute, spreading by stolons in sun to partial shade.

Cold limit: USDA 3-9 · RHS H7 (-34 to 30°C)

What purple-leafed clover's hardiness rating actually means

Yes — purple-leafed clover 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. Purple-leafed Clover is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for purple-leafed clover 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 purple-leafed clover 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 purple-leafed clover can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Purple-leafed Clover hardiness — frequently asked questions

Is purple-leafed clover cold hardy?

Yes — purple-leafed clover 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. Purple-leafed Clover 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 purple-leafed clover can survive?

Minimum survivable temperature is roughly below about −20 °C. Purple-leafed Clover is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is purple-leafed clover?

Purple-leafed Clover is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can purple-leafed clover 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 purple-leafed clover 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.