Cold hardiness & minimum temperature

Is Geranium cinereum 'Lawrence Flatman' (Geranium cinereum 'Lawrence Flatman')cold hardy? Hardiness zone & min temp

Also called Lawrence Flatman cranesbill.

More about geranium cinereum 'lawrence flatman'

About Geranium cinereum 'Lawrence Flatman'

Geranium cinereum 'Lawrence Flatman' · also called Lawrence Flatman cranesbill · flowering

Geranium cinereum 'Lawrence Flatman' is a compact alpine cranesbill with low rosettes of grey-green foliage. Over a long summer season it bears cupped pink flowers heavily veined in crimson-purple with a darker eye, a touch bolder than 'Ballerina'. Sun-loving and tidy, it excels in rock gardens, troughs, gravel beds and free-draining border edges.

Cold limit: USDA 5-8 · RHS H5 (-15 to 24°C)

Watch for — Crown and root rot: Caused by wet or heavy soil, particularly over winter. Plant in sharp drainage, grit the crown, and keep mulch off the rosette to prevent collapse.

What geranium cinereum 'lawrence flatman''s hardiness rating actually means

Yes — geranium cinereum 'lawrence flatman' 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. Geranium cinereum 'Lawrence Flatman' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for geranium cinereum 'lawrence flatman' 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 geranium cinereum 'lawrence flatman' 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 geranium cinereum 'lawrence flatman' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Geranium cinereum 'Lawrence Flatman' hardiness — frequently asked questions

Is geranium cinereum 'lawrence flatman' cold hardy?

Yes — geranium cinereum 'lawrence flatman' 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. Geranium cinereum 'Lawrence Flatman' 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 geranium cinereum 'lawrence flatman' can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Geranium cinereum 'Lawrence Flatman' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is geranium cinereum 'lawrence flatman'?

Geranium cinereum 'Lawrence Flatman' is rated USDA 5-8 and RHS H5 — Hardy in most of the UK and in cold winters.

Can geranium cinereum 'lawrence flatman' 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 geranium cinereum 'lawrence flatman' 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.