Cold hardiness & minimum temperature

Is Pencilled Cranesbill (Geranium versicolor)cold hardy? Hardiness zone & min temp

Also called Pencilled cranesbill, pencilled geranium, veiny geranium.

More about pencilled cranesbill

About Pencilled Cranesbill

Geranium versicolor · also called Pencilled cranesbill, pencilled geranium · flowering

Geranium versicolor is a clump-forming hardy perennial native to southern Italy and the Balkans, bearing white to pale-pink funnel-shaped flowers with striking dark violet veining — as though drawn on with a fine pencil — from late spring to early autumn. It forms a dense, weed-suppressing mat of lobed, mid-green hairy leaves that remains semi-evergreen in mild winters. The most important care note is that it performs well in heavier shade than most cranesbills, making it ideal for difficult spots under trees or on shaded banks. Considered non-toxic to cats and dogs.

Cold limit: USDA 5-8 · RHS H6 (-20 to 25°C)

What pencilled cranesbill's hardiness rating actually means

Yes — pencilled cranesbill is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. 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 −20 to −15 °C. Pencilled Cranesbill is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for pencilled cranesbill as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 pencilled cranesbill 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 pencilled cranesbill can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Pencilled Cranesbill hardiness — frequently asked questions

Is pencilled cranesbill cold hardy?

Yes — pencilled cranesbill is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pencilled Cranesbill 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 pencilled cranesbill can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Pencilled Cranesbill is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is pencilled cranesbill?

Pencilled Cranesbill is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can pencilled cranesbill 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 pencilled cranesbill below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.