Cold hardiness & minimum temperature

Is Pau's Germander (Teucrium carolipaui)cold hardy? Hardiness zone & min temp

Also called Pau's Germander, Bitter Germander.

More about pau's germander

About Pau's Germander

Teucrium carolipaui · also called Pau's Germander, Bitter Germander · flowering

Teucrium carolipaui is a small, aromatic subshrub endemic to southeastern Spain (Murcia and Alicante provinces), where it grows in the driest scrubland, rocky ravines, and stony steppes on calcareous, gypseous, or marl-saline soils. It is closely allied to other compact Iberian germanders and produces the typical two-lipped flowers of the genus in summer. Excellent drainage and full sun are the key requirements; it is well adapted to poor, alkaline substrates and summer drought. The plant is mildly toxic if ingested, consistent with the hepatotoxic diterpene chemistry documented across the Teucrium genus.

Cold limit: USDA 7-10 · RHS H4 (-8 to 35°C)

Watch for — Root and crown rot from excess moisture: The greatest cultivation risk outside its native semi-arid range; grow in a raised scree bed or very gritty soil, and protect from winter rain with a cloche or overhanging rock in wetter regions.

What pau's germander's hardiness rating actually means

Yes — pau's germander is genuinely cold hardy. Rated RHS H4 and USDA 7-10, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 7-10 — 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 −10 to −5 °C. Pau's Germander is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for pau's germander as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 pau's germander go outside or overwinter — and where?

Plant it out within USDA 7-10 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 pau's germander can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline pau's germander

Pau's Germander is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Pau's Germander hardiness — frequently asked questions

Is pau's germander cold hardy?

Yes — pau's germander is genuinely cold hardy. Rated RHS H4 and USDA 7-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pau's Germander is hardy across USDA 7-10; 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 pau's germander can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Pau's Germander is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is pau's germander?

Pau's Germander is rated USDA 7-10 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can pau's germander survive winter outside?

Plant it out within USDA 7-10 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.

How do I protect pau's germander from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.