Dear Angelo:
Many thanks for the info on Iris orientalis. Here in very
rich alkaline soils, year round rains, app. zone 9 b in winter and zone 10
in summer, they and a number of hybrid Spurias seem to suggest a colder
origin, as you point out. They sprout in early winter, flower in spring for
a long period and remain in full growth for the summer and early autumn. As
pointed out in another message, they hate being divided and flower very
abundantly when left to become extensive clumps. They also seem impervious
to long very hot summers.
Regards
Alberto
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