Cold hardiness & minimum temperature

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

Also called ringens cobra lily, gaping cobra lily.

More about arisaema ringens

About Arisaema ringens

Arisaema ringens · also called ringens cobra lily, gaping cobra lily · flowering

Arisaema ringens, the gaping cobra lily, is an East Asian woodland tuber with bold, glossy three-parted leaves and a curiously inrolled, helmet-like green-and-purple spathe that resembles a gaping cobra's hood. An early-emerging, shade-loving perennial, it dies back to a dormant tuber by late summer and wants cool, humus-rich, well-drained soil.

Cold limit: USDA 5-9 (hardy outdoor woodland perennial) · RHS H5 (10-24°C)

Watch for — Winter tuber rot: Cold, wet dormant soil rots tubers. Plant in sharply drained ground or lift in very wet regions.

What arisaema ringens's hardiness rating actually means

Yes — arisaema ringens is genuinely cold hardy. Rated RHS H5 and USDA 5-9 (hardy outdoor woodland perennial), 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 5-9 (hardy outdoor woodland perennial) — 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. Arisaema ringens is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 5-9 (hardy outdoor woodland perennial) 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 arisaema ringens can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Arisaema ringens hardiness — frequently asked questions

Is arisaema ringens cold hardy?

Yes — arisaema ringens is genuinely cold hardy. Rated RHS H5 and USDA 5-9 (hardy outdoor woodland perennial), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Arisaema ringens is hardy across USDA 5-9 (hardy outdoor woodland perennial); 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 arisaema ringens can survive?

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

What hardiness zone is arisaema ringens?

Arisaema ringens is rated USDA 5-9 (hardy outdoor woodland perennial) and RHS H5 — Hardy in most of the UK and in cold winters.

Can arisaema ringens survive winter outside?

Plant it out within USDA 5-9 (hardy outdoor woodland perennial) 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 arisaema ringens 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.