Cold hardiness & minimum temperature

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

Also called Pyrenean Heron's Bill, Manescau Stork's Bill, Heron's Bill.

More about pyrenean heron's bill

About Pyrenean Heron's Bill

Erodium manescavii · also called Pyrenean Heron's Bill, Manescau Stork's Bill · flowering

Erodium manescavii is a robust, clump-forming perennial native to the Pyrenees of France and Spain, producing long-stemmed, showy clusters of five-petalled magenta-purple flowers with darker blotching on the upper petals from early summer through early autumn. It is larger than most Erodium species, forming a dome of finely divided, pinnate, softly hairy leaves to 45 cm, and it earned the RHS Award of Garden Merit for reliable garden performance. Sharp drainage is the single most critical requirement — it resents wet winter soil above all else, and waterlogged crowns are the primary cause of plant death. Erodium species are absent from the ASPCA Toxic Plants database, so toxicity status cannot be confirmed; as a precaution, they are classified as mildly-toxic pending a definitive assessment.

Cold limit: USDA 5-8 · RHS H5 (-15 to 32°C)

Watch for — Crown rot in wet winters: The most common cause of plant death; soggy soil around the crown in cold weather leads to fungal rot and rapid plant collapse — always plant in sharply drained soil and consider a gravel mulch around the crown in high-rainfall gardens.

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

Yes — pyrenean heron's bill is genuinely cold hardy. Rated RHS H5 and USDA 5-8, 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 5-8 — 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 −15 to −10 °C. Pyrenean Heron's Bill is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 5-8 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 pyrenean heron's bill can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Pyrenean Heron's Bill hardiness — frequently asked questions

Is pyrenean heron's bill cold hardy?

Yes — pyrenean heron's bill is genuinely cold hardy. Rated RHS H5 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pyrenean Heron's Bill is hardy across USDA 5-8; 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 pyrenean heron's bill can survive?

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

What hardiness zone is pyrenean heron's bill?

Pyrenean Heron's Bill is rated USDA 5-8 and RHS H5 — Hardy in most of the UK and in cold winters.

Can pyrenean heron's bill survive winter outside?

Plant it out within USDA 5-8 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 pyrenean heron's bill 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.