Tanisha A. answered 29d
The most probable causes for the water in your bamboo containers to turn from green to blue are:
Algae change: The green color is likely due to green algae. A change in nutrients from the fertilizer or the plants' needs could be triggering a different type of algae or bacteria, like blue-green algae (cyanobacteria), to grow.
Fertilizer reaction: The "Super Green" fertilizer likely uses copper compounds as part of its formula, which can turn water blue. It's possible the formulation of the product has changed, or that an imbalance in your water is causing the copper to become more concentrated or visible.
Water quality: Different trace elements present in your water supply can react with fertilizer, and the specific pH or mineral content can cause color changes. This often happens if you don't use filtered or distilled water, to which bamboo is sensitive.