Bamboo plants grow in clumps and then form bamboo stalks. They grow from rhizomes or seeds. As bamboo stalks grow larger, they form rhizomes. The rhizomes can spread out around the mature stalks of bamboo and grow new bamboo stalks.
Bamboo plants can also self-seed. This occurs asexually whenever environmental changes affect the soil and plant growth. As the environment changes, the bamboo clump stops growing, and it instead forms flowers. The flowers fall to the ground, and their seeds then germinate in the soil. After a few weeks, a new bamboo clump can form and produce new bamboo stalks.