An aquatic cultivation method for woody and drought-tolerant plants creates a symbiotic system of stable structure by steps of: (1) placing a seed in a pan for three to four weeks to grow an aquatic plant (2) taking the aquatic plant out of the pan and removing dirt (3) dipping the dirt-free aquatic plant into a beaker filled with a cultural liquid of somatotropic hormone for two to three hours (4) taking out the aquatic plant and placing it into a container (5) filling a substance into the container for securing the aquatic plant placed inside (6) positioning the container on a water tank filled with water that the root of the aquatic plant can contact the water surface and (7) completing cultivation when the root of the aquatic plant naturally extending into the water as adopted to an aquatic environment inside the water tank through time.
