Answer: There are different calla lily species with slightly different requirements, so it is always helpful when sending a question to include the complete botanical name, e.g., Zantedeschia aethiopica for common calla. If yours is indeed common calla, it should take full sun for 6-8 hours in your region. It can also take filtered shade. Keep soil consistently moist, but not wet. They are native to South Africa so can not take cold temperatures. Place it outside when danger of frost is over (and bring indoors in the fall before frost). Use a slow-release fertilizer or any general fertilizer for blooming plants or bulbs according to package instructions. Callas typically don't need a lot of repotting. Your plant's failure to bloom is an indication that the growing conditions are not quite right. Since you've tried changing everything, I'm at a loss at what to suggest! Just be patient with your plant and it may yet bloom for you. Hope so!
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