Cold hardiness & minimum temperature

Is Armenian Speedwell (Veronica armena)cold hardy? Hardiness zone & min temp

Also called Armenian speedwell, Gentian speedwell.

More about armenian speedwell

About Armenian Speedwell

Veronica armena · also called Armenian speedwell, Gentian speedwell · flowering

Veronica armena is a dwarf alpine perennial native to mountainous regions of Turkey, Armenia, and the Caucasus, where it colonises dry, sunny, rocky slopes. It forms a tight evergreen carpet of finely divided, needle-like dark-green foliage under 10 cm tall, studded with small but vivid gentian-blue flowers with a white eye in late spring to early summer. Its most important care requirement is full sun and perfectly drained, lean soil — it dislikes shade and wet winters intensely. Veronica is listed as non-toxic to cats and dogs by the ASPCA.

Cold limit: USDA 4-9 · RHS H6 (-25 to 28°C)

Watch for — Crown rot in wet winters: Persistently moist crowns during dormancy cause rotting at the base. Grow in a raised bed or trough and protect with a pane of glass or cloche in regions with wet winters.

What armenian speedwell's hardiness rating actually means

Yes — armenian speedwell is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4-9 — 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 −20 to −15 °C. Armenian Speedwell is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for armenian speedwell as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 armenian speedwell go outside or overwinter — and where?

Plant it out within USDA 4-9 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 armenian speedwell can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Armenian Speedwell hardiness — frequently asked questions

Is armenian speedwell cold hardy?

Yes — armenian speedwell is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Armenian Speedwell is hardy across USDA 4-9; 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 armenian speedwell can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Armenian Speedwell is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is armenian speedwell?

Armenian Speedwell is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can armenian speedwell survive winter outside?

Plant it out within USDA 4-9 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 armenian speedwell below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.