Answer: Mold on the soil indicates overly wet conditions and poor air circulation. You might be able to scrape or peel the mold off the soil. If not, repot your plants in fresh potting soil and try watering them from below, making sure the top of the soil dries out before watering again. Bamboo like to grow in soil rather than in water (except the Lucky Bamboo, which thrives in plain water). Best wishes with your plants!
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