You can divide your plants annually, but it's not necessary until they're overcrowded and aren't blooming well. Water your irises through the summer and flood them twice in January, when they're growing and preparing their spring blooms. The vine gets its name from the potato-like tubers that appear under the foliage in late summer and fall. These are harvested in late fall before frost and planted in spring when the soil has warmed. Full sun and an organically enriched, well-draining soil is best.
Vines freeze back to the ground and reappear in warm weather.
The tubers, grown only as ornamentals here, are occasionally seen in nurseries, often in a basket on the check-out counter. I purchased blooming cyclamen last fall. They are still blooming in pots ouside. I need to know how to care for them to have them flower again next fall and winter. I also would like to know when to plant freesia.