[aroid-l] Arum purpureospathum & dioscoridis hardiness

I have Arum purpureospathum  and A. dioscoridis, grown from seed,
living in pots. 

I would like to plant these guys in the ground rather than keep them
in the greenhouse, but am a tad nervous, despite the hardy aroid list
saying that they are being grown in z 4, Ithaca NY and z 5b, Kansas
City, MO, respectively.  Ellen Hornig's catalog says A. dioscoridis
is z 8 and every other web resource is saying 7b-8 or warmer for both
of them.

I really don't want to lose these children if I can avoid it.

Would appreciate hearing from any of you who grow these in the ground
in z 7a or 6b with success and what kind of conditions you're growing
them in - sun/shade/drainage - and what kind (if any) protection
you're giving them.

Thanks!

Marge Talt, zone 7 Maryland
mtalt@hort.net
Editor:  Gardening in Shade
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