Cold hardiness & minimum temperature

Is Pink Variable Heron's Bill (Erodium x variabile 'Roseum')cold hardy? Hardiness zone & min temp

Also called Pink Variable Heron's Bill, Pink Stork's Bill, Variable Heron's Bill.

More about pink variable heron's bill

About Pink Variable Heron's Bill

Erodium x variabile 'Roseum' · also called Pink Variable Heron's Bill, Pink Stork's Bill · flowering

Erodium x variabile 'Roseum' is a garden hybrid between E. corsicum and E. reichardii, producing a compact, trailing mat of dark grey-green lobed leaves studded with deep rose-pink flowers (to 1.5 cm across) with darker veining throughout summer. It holds an RHS Award of Garden Merit and is perfectly suited to rock gardens, raised beds, alpine troughs, and the tops of dry stone walls. Sharp drainage is the single most critical requirement. This species is not listed by the ASPCA as toxic and is considered low-risk to pets.

Cold limit: USDA 7-9 · RHS H5 (-15 to 25°C)

Watch for — Root rot from winter moisture: The hybrid shares its parents' intolerance of winter wet; improve drainage with a grit layer beneath the rootball and avoid overhead irrigation from autumn onwards.

What pink variable heron's bill's hardiness rating actually means

Yes — pink variable heron's bill is genuinely cold hardy. Rated RHS H5 and USDA 7-9, 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 7-9 — 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. Pink Variable Heron's Bill is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 7-9 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 pink variable 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.

Frost protection for borderline pink variable heron's bill

Pink Variable Heron's Bill 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.

Pink Variable Heron's Bill hardiness — frequently asked questions

Is pink variable heron's bill cold hardy?

Yes — pink variable heron's bill is genuinely cold hardy. Rated RHS H5 and USDA 7-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pink Variable Heron's Bill is hardy across USDA 7-9; 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 pink variable heron's bill can survive?

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

What hardiness zone is pink variable heron's bill?

Pink Variable Heron's Bill is rated USDA 7-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can pink variable heron's bill survive winter outside?

Plant it out within USDA 7-9 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 pink variable heron's bill 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.