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.

地下由原生和侧生部分组成，其生长发育可划分为5个阶段：原生分化期、原生膨大期、侧生形成期、快速膨大期、充实期。