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大丽花花芽分化形态变化过程，可分为营养锥阶段、生殖锥阶段、总苞分化阶段、舌状花分化阶段、管状花分化阶段５个时期。其花芽分化顺序是向心的。顶生花芽和侧生花芽均由营养锥分化而成。舌状花为单性花，管状花为两性花。其花器变异十分普遍，花芽分化受光周期、扦插时间、营养水平等因素影响，因而整个花序上的舌状花与管状花数目不定。若条件适宜，大丽花全年均可形成花芽。
Dahlia flower bud differentiation morphological changes can be divided into nutrition cone stage, reproductive cone stage, involucre differentiation stage, tongue flower differentiation stage, tubular flower differentiation stage 5 periods. The flower bud differentiation order is centripetal. Top flower buds and lateral flower buds are derived from the nutrient cone. Tongue flower is unisexual, tubular flowers are bisexual flowers. The floral variations are very common, flower bud differentiation affected by the light cycle, cutting time, nutrient levels and other factors, and therefore the entire inflorescence of the tongue flowers and tubular flowers in varying numbers. If the conditions are right, Dahlia flower buds can be formed throughout the year.