Cold hardiness & minimum temperature

Is Yellow Heron's Bill (Erodium chrysanthum)cold hardy? Hardiness zone & min temp

Also called Yellow Heron's Bill, Silver Heronsbill, Golden Storksbill.

More about yellow heron's bill

About Yellow Heron's Bill

Erodium chrysanthum · also called Yellow Heron's Bill, Silver Heronsbill · flowering

Erodium chrysanthum is a dense, tufted, evergreen perennial native to central and southern Greece, grown as much for its attractive mound of finely divided, silvery-grey, fern-like foliage as for its pale creamy-yellow flowers (occasionally pale pink on female plants of this dioecious species) that appear from late spring through summer. It is a classic alpine or rock garden plant that demands sharp drainage and a baking sunny position to replicate its native scree and rocky hillside habitat. The silvery foliage is its chief ornamental asset year-round, making it worthwhile even when not in flower. Erodium species are absent from the ASPCA Toxic Plants database, so toxicity status cannot be confirmed; it is classified as mildly-toxic as a precaution.

Cold limit: USDA 6-8 · RHS H4 (-10 to 30°C)

Watch for — Crown rot from winter wet: The most common cause of death in UK gardens; the crown and roots rot when water sits around them in cold weather — always plant in sharply drained soil, add a grit collar around the crown, and consider moving container plants under cover from November to March.

What yellow heron's bill's hardiness rating actually means

Yes — yellow heron's bill is genuinely cold hardy. Rated RHS H4 and USDA 6-8, 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 6-8 — 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 about −10 to −5 °C. Yellow Heron's Bill is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for yellow heron's bill 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 yellow heron's bill go outside or overwinter — and where?

Plant it out within USDA 6-8 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 yellow heron's bill can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Yellow Heron's Bill hardiness — frequently asked questions

Is yellow heron's bill cold hardy?

Yes — yellow heron's bill is genuinely cold hardy. Rated RHS H4 and USDA 6-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Yellow Heron's Bill is hardy across USDA 6-8; 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 yellow heron's bill can survive?

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

What hardiness zone is yellow heron's bill?

Yellow Heron's Bill is rated USDA 6-8 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can yellow heron's bill survive winter outside?

Plant it out within USDA 6-8 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 yellow heron's bill below its minimum temperature?

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.