Arisaema hardiness

[Jean Halverson]

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I have overwintered the following outside for at least several years in
southwestern Wisconsin USA.  The overnight temps can drop to -20F for a few
days each winter.  We don't have reliable snow cover but usually have at
least several inches when temps get that low.



amurense

fargesii

consanguineum

candidissimum

flavum ssp abbreviatum

griffithii

sikokianum

serratum

thunbergii ssp urashima

heterophylum



and of course the native triphyllum and dracontium



The past few winters have been milder than normal so I don't know what will
happen when a typical zone 4 winter comes again.  I usually spread several
inches of mulch over the areas where arisaema are planted.



I have had limited seed production so far.  I think that's because I don't
have a mix of male and female plants for some of the species yet.  Some of
these, especially fargesii and candidissimum, appear in late June/early July
and any seed heads don't ripen outside before freezing temperatures arrive.




Jean Halverson

Dodgeville WI. USA

Zone 4/5 depending on how badly I want an item!









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