Answer: Caladiums need warm temperatures to sprout and are best started indoors in March and set outdoors in May. Optimum temperature is 75F for sprouting and growing caladiums, so perhaps your basement isn't quite warm enough for successful sprouting. Caladium bulbs should be planted two-inches deep, knobby side up, in fast-draining potting soil. They can take from 30-90 days to sprout when kept at 70F to 85F. Don't give up on yours yet! Provide warm temperatures and they should sprout.
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