ARISAEMA HARDINESS

Below is a compilation of arisaema hardiness ratings that we have compiled. We include the lowest temperatures that each species has tolerated without the benefit of snow cover. We always welcome additional input.
Arisaema amurense (zone 4-9, Ontario) -30F. Arisaema angustatum peninsulae (zone 7-9, RI) 0F Arisaema bockii (zone 5 Ithaca, NY) -25F Arisaema candidissimum (zone 5a Northboro) -20F Arisaema caudatum (zone 8b Hamilton, NZ) 15F Arisaema ciliatum (zone 7a Dover, DE) 0F Arisaema concinnum (zone 7-9 RI) 0F Arisaema consanguineum (zone 5a Hubbardston,MA) -20F Arisaema costatum (zone 7-9 RI) 0F Arisaema dracontium (zone 4, Canada) -30F Arisaema erubescens (zone 8b Hamilton, NZ) 15F Arisaema exappendiculatum (zone 7) 0F Arisaema fargesii (zone 6 Kansas City, MO) -15F Arisaema flavum (zone 4-7, VT) -30F Arisaema franchetianum (zone 7, RI) 0F Arisaema fraternum (zone 7 Wrexham, ENG) 5F Arisaema galeatum (zone 7 RI) 0F Arisaema griffithii (zone 6-9? RI) 0F Arisaema helleborifolium (zone 7b Wrexham, ENG) 10F Arisaema heterophyllum (zone 5 Girard) -25F Arisaema intermedium (zone 7-9 RI) 0F Arisaema jacquemontii (zone 5b North Reading, MA) -20F Arisaema japonica (syn: serratum) (zone 5 Northboro, MA) -20F Arisaema kiushianum (zone 7 RI) -10F Arisaema macrospathum (zone 7 RI) 0F Arisaema nepenthoides (zone 6b-9? Dover, DE) -5F Arisaema ochraceum (zone 7-9 RI) 0F Arisaema peninsulae (zone 8b Hamilton, NZ) 15F Arisaema propinquum (zone 7-9?) (zone 8b Hamilton, NZ) 15F Arisaema ringens (zone 5 Girard) -25F Arisaema robustum (zone 6 York, PA) -15F Arisaema sikokianum (zone 4 Minneapolis, MN) -30F Arisaema sikokianum x takedae (zone 6b Washington DC) -5F Arisaema speciosum (zone 7 RI) 0F Arisaema stewardsonii (zone 4, Canada) -30F Arisaema takadae (zone 7a Great Falls, VA) -5F Arisaema thunbergii (zone 5-9? Northboro, MA) -10F Arisaema tortuosum (zone 7a Great Falls, Va) -5F Arisaema triphyllum (zone 3 Canada) -40F Arisaema urashima (zone 5-8, Ithaca NY) -25F Arisaema verrucosum (zone 7-9?) Arisaema yamatense (zone 7 RI) 0F Arisaema yunnanense (zone 7 RI) 0F