Cold hardiness & minimum temperature

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

Also called Blushing Arisaema, Blushing Cobra Lily.

More about blushing arisaema

About Blushing Arisaema

Arisaema erubescens · also called Blushing Arisaema, Blushing Cobra Lily · flowering

Blushing Arisaema is a woodland aroid from China and Southeast Asia bearing a striking hooded spathe flushed pink to deep maroon above creamy white stripes. It grows from a flat corm in humus-rich, consistently moist shade, dies back to dormancy in autumn, and returns reliably each spring. Excellent for a shaded border or woodland garden.

Cold limit: USDA 6-9 · RHS H5 (10–25°C growing; corms tolerate down to -10°C with mulch)

Watch for — Corm rot in wet winters: Poorly drained soil combined with winter moisture is the leading cause of loss. Plant in raised beds or containers with excellent drainage, and cover with a thick dry mulch in autumn. In very wet climates, lift corms and store frost-free in dry compost.

What blushing arisaema's hardiness rating actually means

Yes — blushing 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. Blushing Arisaema is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for blushing 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 blushing 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 blushing arisaema can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Blushing Arisaema hardiness — frequently asked questions

Is blushing arisaema cold hardy?

Yes — blushing 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. Blushing 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 blushing arisaema can survive?

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

What hardiness zone is blushing arisaema?

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

Can blushing 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 blushing 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.