Answer: If you think of bamboo as a giant grass, you'll understand their need for water and ferilizer. Although you water frequently, you may not be watering enough. Plants in pots can become pot-bound and the entire pot can be filled with roots. As a result, although you're watering a lot, not enough water is reaching the roots. Another common problem with plants in pots is that air pockets form within the root mass. Again, water can run out of the drainage holes, yet the potting soil might still be dry in places. I think I'd repot the bamboos. Use the next sized pot, make sure there are lots of drainage holes in the bottom, fill the pots with moistened regular potting soil and replant your bamboos. Then water thoroughly to help settle the soil. Every week or two, immerse the pots in a larger container of water to make sure you drive out any air pockets. In between soakings, check the soil moisture by sticking your finger into the pot; if it's dry one inch below the surface, it's time to water. As for feeding, use a half-strength dilution of liquid ferilizer and apply every 2-3 weeks during the growing season. This will supply an almost constant source of nutrients to the roots of your plants.
Best wishes with your bamboo!
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