Cold hardiness & minimum temperature

Is Pink Arisaema (Arisaema candidissimum)cold hardy? Hardiness zone & min temp

Also called pink cobra lily, white-spathed arisaema.

More about pink arisaema

About Pink Arisaema

Arisaema candidissimum · also called pink cobra lily, white-spathed arisaema · flowering

Arisaema candidissimum is a charming Chinese woodland perennial with one of the prettiest, least sinister flowers in the genus — a softly pink-and-white striped, sweetly scented spathe. It emerges late, after which a single large three-parted leaf unfurls. Grown from a corm, it wants cool, moist, humus-rich shade and a dry winter rest.

Cold limit: USDA 6-9 · RHS H5 (13-24°C)

Watch for — Winter-wet corm rot: Cold, sodden soil rots the dormant corm. Plant in gritty, free-draining woodland soil and keep it on the dry side over winter, or lift and store dry.

What pink arisaema's hardiness rating actually means

Yes — pink arisaema is genuinely cold hardy. Rated RHS H5 and USDA 6-9, 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 6-9 — 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 Arisaema is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for pink arisaema 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 arisaema go outside or overwinter — and where?

Plant it out within USDA 6-9 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 arisaema can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Pink Arisaema hardiness — frequently asked questions

Is pink arisaema cold hardy?

Yes — pink arisaema is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pink Arisaema is hardy across USDA 6-9; 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 arisaema can survive?

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

What hardiness zone is pink arisaema?

Pink Arisaema is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can pink arisaema survive winter outside?

Plant it out within USDA 6-9 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.

What happens to pink arisaema 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.