Answer: I think I'd dig them up to make sure they are still alive. Calla lilies should sprout when planted in moist soil and if you keep the soil from drying out during the growing season. In general, Calla Lilies need to be planted deeply for their size. Plant them at a depth of 4 inches, spacing each bulb 12 inches apart. Apply a bulb fertilizer monthly during the active growing season. Calla Lillies can also be grown as house plants if placed in a sunny window. Most Calla Lilies need a rest period after flowering, so gradually withhold water until the leaves die back and let plants rest for 2 to 3 months before resuming watering to encourage new growth.
Good luck with your calla lilies!
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