Cold hardiness & minimum temperature

Is Burgundy Glow Bugle (Ajuga reptans 'Burgundy Glow')cold hardy? Hardiness zone & min temp

Also called Burgundy Glow Bugle, Burgundy Glow Bugleweed.

More about burgundy glow bugle

About Burgundy Glow Bugle

Ajuga reptans 'Burgundy Glow' · also called Burgundy Glow Bugle, Burgundy Glow Bugleweed · flowering

An AGM-awarded Ajuga cultivar celebrated for its extraordinary tricoloured foliage — silver-white, pink-rose, and deep burgundy — in a low, spreading mat. Blue flower spikes in spring complement the colourful leaves. A standout groundcover for shaded borders and underplanting, where few other plants offer such vivid variegated foliage in limited light.

Cold limit: USDA 3-9 · RHS H7 (-20–28°C)

What burgundy glow bugle's hardiness rating actually means

Yes — burgundy glow bugle 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. Burgundy Glow Bugle is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for burgundy glow bugle 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 burgundy glow bugle 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 burgundy glow bugle can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Burgundy Glow Bugle hardiness — frequently asked questions

Is burgundy glow bugle cold hardy?

Yes — burgundy glow bugle 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. Burgundy Glow Bugle 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 burgundy glow bugle can survive?

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

What hardiness zone is burgundy glow bugle?

Burgundy Glow Bugle is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can burgundy glow bugle 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 burgundy glow bugle 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.