Cold hardiness & minimum temperature

Is Germander Speedwell (Veronica chamaedrys)cold hardy? Hardiness zone & min temp

Also called Germander Speedwell, Bird's-eye Speedwell, Angel's Eyes.

More about germander speedwell

About Germander Speedwell

Veronica chamaedrys · also called Germander Speedwell, Bird's-eye Speedwell · flowering

Veronica chamaedrys is a low-growing native perennial wildflower found throughout the UK, Europe, and temperate Asia, typically carpeting grassy banks, hedgerows, and woodland edges with vivid sky-blue flowers from early spring to midsummer. It thrives in moist, reasonably fertile soil in sun or partial shade and spreads by creeping, rooting stems to form a dense, weed-suppressing mat. The most important care point is to keep soil consistently moist during dry spells, as the plant quickly wilts under drought. It is considered non-toxic to cats and dogs.

Cold limit: USDA 3-7 · RHS H7 (-30 to 28°C)

What germander speedwell's hardiness rating actually means

Yes — germander speedwell is genuinely cold hardy. Rated RHS H7 and USDA 3-7, 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 3-7 — 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. Germander Speedwell is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for germander speedwell 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 germander speedwell go outside or overwinter — and where?

Plant it out within USDA 3-7 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 germander speedwell can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Germander Speedwell hardiness — frequently asked questions

Is germander speedwell cold hardy?

Yes — germander speedwell is genuinely cold hardy. Rated RHS H7 and USDA 3-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Germander Speedwell is hardy across USDA 3-7; 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 germander speedwell can survive?

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

What hardiness zone is germander speedwell?

Germander Speedwell is rated USDA 3-7 and RHS H7 — Hardy in the severest European continental winters.

Can germander speedwell survive winter outside?

Plant it out within USDA 3-7 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 germander speedwell 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.