The grow progress of bulb is divided to 5 stages: probulb idiophase, probulb enlargement stage, primarybulb idiophase, bulb weight fast gain stage and bulb plenum stage.

地下由原和侧两部组成，其长发育为5个阶段：原化期、原膨大期、侧形成期、快速膨大期、充实期。