Arisaema seeds and hardiness

[McClements, Jim]

Frisk

The failure of your A. sikokianum to survive the winter is more likely to be
due to wetness and rot than to temperature. It's generally pretty cold hardy,
but more sensitive than most to wet conditions while dormant.

Also, as Roy Herold has pointed out, arisaemas can stand a great deal of cold
if they are planted deep in the ground, up to 18 inches! Of course, that may
tend to subject them to more of a wetness problem, unless good drainage is
assured.

Jim McClements