- I live in northern Wisconsin, I would like to plant calla lily in clay pots and start them in the house in a south window ( 1 bulb per pot) Then place them outside. Is it possible? How soon should I see growth and how soon should I place them outside?
- You can start the rhizomes indoors in full sun. Plant them so that the tips is just below soil level, the rough nubby side up. They sould come up in a couple of weeks. Water and keep the soil moist but not wet. Move outdoors when night temperatures are no lower than 50 degrees. The initial blooming time can be 8-14 wks depending on variety and growing conditions. White callas (Zantedeschia aethiopica) take 11-14 wks, cooler temps and need moist soil. Colored hybrid callas (Zantedeschia hybrids) can take 8 wks to bloom and need warmer temps and less moisture.
- Calla lilies are summer blooming plants hardy in zone 7-10. They will not tolerate frost. When grown outdoors in cool climates, be sure to dig them up in the fall and store them in slightly moist soil in a cool, dry place for the winter. Calla lilies are not hardy in Wisconsin.