Cold hardiness & minimum temperature

Is Aroanian Germander (Teucrium aroanium)cold hardy? Hardiness zone & min temp

Also called Aroanian germander, Mount Aroania germander.

More about aroanian germander

About Aroanian Germander

Teucrium aroanium · also called Aroanian germander, Mount Aroania germander · flowering

Teucrium aroanium is a compact, mat-forming sub-shrub endemic to the high mountain zones of the Peloponnese in Greece, particularly on the limestone peaks of Mount Aroania (Chelmos). It forms low, spreading cushions of small, grey-green to silver leaves studded with small pink to purple flowers in summer, making it an ideal alpine or rock-garden subject. The critical care point is excellent drainage and grit, mirroring its high-altitude scree habitat; it abhors winter wet far more than frost. As with other Teucrium species, treat as mildly toxic to pets.

Cold limit: USDA 5-9 · RHS H5 (-15 to 30°C)

Watch for — Winter wet rot: The leading cause of loss in cultivation; the crown and roots are highly susceptible to fungal rots in persistently wet winter soil. A pane of glass over the plant or alpine house protection resolves this.

What aroanian germander's hardiness rating actually means

Yes — aroanian germander is genuinely cold hardy. Rated RHS H5 and USDA 5-9, 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 5-9 — 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 −15 to −10 °C. Aroanian Germander is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 5-9 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 aroanian germander can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Aroanian Germander hardiness — frequently asked questions

Is aroanian germander cold hardy?

Yes — aroanian germander is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Aroanian Germander is hardy across USDA 5-9; 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 aroanian germander can survive?

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

What hardiness zone is aroanian germander?

Aroanian Germander is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can aroanian germander survive winter outside?

Plant it out within USDA 5-9 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 aroanian germander 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.