Cold hardiness & minimum temperature

Is Green Arrow Arum (Peltandra virginica)cold hardy? Hardiness zone & min temp

Also called arrow arum, tuckahoe, Virginia tuckahoe, bog onion.

More about green arrow arum

About Green Arrow Arum

Peltandra virginica · also called arrow arum, tuckahoe · flowering

Green Arrow Arum is a native North American aquatic perennial with bold, glossy arrow-shaped leaves up to 30 cm long. It thrives at pond margins or in shallow water to 20 cm deep, forms dense non-aggressive clumps, and bears greenish-white spathes in late spring. All parts contain calcium oxalate and are toxic if eaten raw.

Cold limit: USDA 4-9 · RHS H6 (5–28°C)

What green arrow arum's hardiness rating actually means

Yes — green arrow arum is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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 −20 to −15 °C. Green Arrow Arum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for green arrow arum 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 green arrow arum go outside or overwinter — and where?

Plant it out within USDA 4-9 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 green arrow arum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Green Arrow Arum hardiness — frequently asked questions

Is green arrow arum cold hardy?

Yes — green arrow arum is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Green Arrow Arum is hardy across USDA 4-9; 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 green arrow arum can survive?

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

What hardiness zone is green arrow arum?

Green Arrow Arum is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can green arrow arum survive winter outside?

Plant it out within USDA 4-9 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 green arrow arum 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.