Re: Hardiness of Species Irises


 



From my notes:
 
Houseplant only:
I. japonica
 
To -15:
 
I. odaesanensis
 
 
To -20:
 
I. korolkowii 
I. brevicaulis
I. giganticerulea
I. typhifolia
most Sino-Siberian species (not the hybrids)
 
 
To  -25:
I. fulva
I. ensata
I. cristata
I. lactea
Laevigata colchesterensis
 

Still kicking after -28:
 
I. dichotoma
I. stolonifera
I. fulva dwarf
I. sanguinea
I. siberica
I. carthalineae
I. ochroleuca
I. monnerii
I. mzchetica
I. maackii
I. pseudacorus
I. versicolor
I. missouriensis
I. setosa
bearded species
 
 
Christy Hensler
Newport, WA
zone 4b



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