Cold hardiness & minimum temperature

Is Yellow Germander (Teucrium flavum)cold hardy? Hardiness zone & min temp

Also called Yellow germander, Pale germander.

More about yellow germander

About Yellow Germander

Teucrium flavum · also called Yellow germander, Pale germander · herb

Teucrium flavum is a compact, woody-based perennial or sub-shrub native to the central and eastern Mediterranean — southern Italy, the Balkans, Greece, and Turkey — growing on dry limestone rocks and scrub from sea level to mid-altitude. It is the only yellow-flowered species commonly cultivated in the genus, producing clusters of pale primrose-yellow two-lipped flowers on white-felted stems through late spring and early summer above dark green, aromatic foliage. Good drainage and full sun are the critical requirements; it is a reliable plant on dry, alkaline soils. Treat as mildly toxic to pets in line with the Teucrium genus.

Cold limit: USDA 6-10 · RHS H5 (-10 to 35°C)

Watch for — Winter dieback on wet, heavy soils: Established plants usually reshoot from the base after cold winters, but persistent waterlogging in winter is fatal; improve drainage before planting rather than hoping for recovery.

What yellow germander's hardiness rating actually means

Yes — yellow germander is genuinely cold hardy. Rated RHS H5 and USDA 6-10, 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 6-10 — 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 −15 to −10 °C. Yellow Germander is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 6-10 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 yellow germander can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Yellow Germander hardiness — frequently asked questions

Is yellow germander cold hardy?

Yes — yellow germander is genuinely cold hardy. Rated RHS H5 and USDA 6-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Yellow Germander is hardy across USDA 6-10; 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 yellow germander can survive?

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

What hardiness zone is yellow germander?

Yellow Germander is rated USDA 6-10 and RHS H5 — Hardy in most of the UK and in cold winters.

Can yellow germander survive winter outside?

Plant it out within USDA 6-10 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.

What happens to yellow 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.