Cold hardiness & minimum temperature

Is Compacta Sage (Salvia officinalis 'Compacta')cold hardy? Hardiness zone & min temp

Also called Dwarf Sage, Compact Sage.

More about compacta sage

About Compacta Sage

Salvia officinalis 'Compacta' · also called Dwarf Sage, Compact Sage · herb

Salvia officinalis 'Compacta' is a dwarf culinary sage forming a tidy, dense mound of grey-green aromatic leaves. Slower and smaller than common sage, it suits pots, edging and small herb beds. Drought-tolerant once established, it loves full sun and sharp drainage, delivering the same warm, savoury flavour from a compact, low-maintenance plant.

Cold limit: USDA 5-8 (hardy perennial outdoors) · RHS H5 (15-24°C)

Watch for — Winter dieback: Cold, wet soil can damage roots over winter, especially in containers. Improve drainage, shelter pots from prolonged wet and avoid hard pruning in autumn.

What compacta sage's hardiness rating actually means

Yes — compacta sage is genuinely cold hardy. Rated RHS H5 and USDA 5-8 (hardy perennial outdoors), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 5-8 (hardy perennial outdoors) — 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 −15 to −10 °C. Compacta Sage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for compacta sage as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 compacta sage go outside or overwinter — and where?

Plant it out within USDA 5-8 (hardy perennial outdoors) 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 compacta sage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Compacta Sage hardiness — frequently asked questions

Is compacta sage cold hardy?

Yes — compacta sage is genuinely cold hardy. Rated RHS H5 and USDA 5-8 (hardy perennial outdoors), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Compacta Sage is hardy across USDA 5-8 (hardy perennial outdoors); 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 compacta sage can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Compacta Sage is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is compacta sage?

Compacta Sage is rated USDA 5-8 (hardy perennial outdoors) and RHS H5 — Hardy in most of the UK and in cold winters.

Can compacta sage survive winter outside?

Plant it out within USDA 5-8 (hardy perennial outdoors) 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 compacta sage below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.