Huh? How can I tell whaich side is the crown and which is the root?Isabella said:Yup, Aponogetons do need fertilization and good lighting as well. They're at least medium-light plants. When you plant the bulb, make sure that the root part is facing the bottom and that the crown part (where the leaves will begin to grow) is facing the light. Also, the crown cannot be buried under gravel.