additions for the Aroid hardiness list

I've been testing the following aroids outside in the garden (Raleigh, NC, 
USA),
USDA zone 7b.  Some have been planted out for as long as 6 years, while
others have only been outside for 3 years.  But given the winter we just 
had,
I feel reasonably comfortable that they can be considered cold hardy.

Other folks may have already discovered these to by cold hardy, but they 
currently
aren't listed on the IAS aroid hardiness list:
http://aroid.org/horticulture/hardy.php

Amorphophallus:
    henryi
    yuloensis
    dunnii
    symonianus
    krausei
    thaiensis

Arisaema:
    barnesii
    jinshajiangense
    muratae

Arum:
    albispathum
    hygrophilum
    nigrum

Carlephyton
    madagascariense

Colocasia
    heterochroma

Remusatia
    hookeriana

Spathantheum
    fallax

Typhonium
    diversifolium
    horsfieldii
    trilobatum

alan


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