Answer: This depends partly on what kind of bulbs you are trying to grow. However, spring blooming bulbs being forced can sometimes turn moldy if they are kept too wet and/or too warm and wet. Summer bulbs can sometimes turn moldy if they are planted in soil that is too cold, or kept more than slightly damp. Also, you would want to use a good quality potting mix formulated for container growing for your summer bulbs rather than garden soil. I hope this helps you trouble shoot.
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