After taking cuttings from an established bamboo plant, you can either replant the cuttings in soil or you can continue growing the cuttings hydroponically. Growing bamboo cuttings hydroponically -- in water -- is similar to growing the cuttings in soil. As with soil-based bamboo plants, you must establish a system for holding the bamboo cuttings upright in the water base.
Keep the bottoms of the cuttings wet while you prepare the permanent container for the cuttings. Either place the cuttings in a tall vase in which they can lean against the side or wrap the bottoms with wet paper towels.
Prepare the container in which you intend to place the bamboo cuttings. One way to do this is to cut holes in a piece of wire mesh large enough to allow the bamboo cuttings to pass through and place it over the opening of the container. Another way to prepare a container is to fill the container with clean stones or marbles at least three-quarters of the way up.
Fill the container with fresh, clean water. If using tap water, let the water sit out uncovered in a separate container for 24 hours before adding it to the bamboo container. Add two drops of plant food to the water. Aquarium plant food gives the best results.
Place the bamboo cuttings into the container. If using wire mesh, pass each stalk through a hole in the mesh, lowering it down until the bamboo cutting touches bottom or is at least submerged a few centimetres in the water. If using rocks or marbles, push the cuttings into the rocks or marbles one at a time until they touch bottom.
Change the water for the bamboo cuttings at least once a week by holding your hand over the opening of the container and holding the cuttings in place and pouring the water out the top. Replace the water with fresh, clean water and add plant food with each change.
Watch the water base of your bamboo plants. If the water starts to turn grey or brown before the weekly change, you should change the water more frequently.