Cold hardiness & minimum temperature

Is Lady's Bedstraw (Galium verum)cold hardy? Hardiness zone & min temp

Also called Lady's Bedstraw, Yellow Bedstraw, Our Lady's Bedstraw.

More about lady's bedstraw

About Lady's Bedstraw

Galium verum · also called Lady's Bedstraw, Yellow Bedstraw · herb

Lady's bedstraw is a mat-forming perennial native across the UK, abundant in dry grassland, chalk downland, coastal dunes, and road verges. Its dense honey-scented froth of bright yellow flowers, produced from July to August, was historically used to curdle milk for cheese-making and to stuff mattresses. It thrives in poor, well-drained soils in full sun and requires no feeding — rich soils suppress flowering. No toxicity to cats or dogs is documented; it is generally considered safe for gardens shared with pets.

Cold limit: USDA 4-8 · RHS H7 (-20–25 °C)

What lady's bedstraw's hardiness rating actually means

Yes — lady's bedstraw is genuinely cold hardy. Rated RHS H7 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 4-8 — 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 below about −20 °C. Lady's Bedstraw is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for lady's bedstraw as it gets too cold:

It tolerates winter lows to about −20 °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 lady's bedstraw go outside or overwinter — and where?

Plant it out within USDA 4-8 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 lady's bedstraw can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Lady's Bedstraw hardiness — frequently asked questions

Is lady's bedstraw cold hardy?

Yes — lady's bedstraw is genuinely cold hardy. Rated RHS H7 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Lady's Bedstraw is hardy across USDA 4-8; 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 lady's bedstraw can survive?

Minimum survivable temperature is roughly below about −20 °C. Lady's Bedstraw is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is lady's bedstraw?

Lady's Bedstraw is rated USDA 4-8 and RHS H7 — Hardy in the severest European continental winters.

Can lady's bedstraw survive winter outside?

Plant it out within USDA 4-8 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 lady's bedstraw below its minimum temperature?

It tolerates winter lows to about −20 °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.