Traditionally, synthesizing the animation of floral blossom is accomplished mostly manually and hence a time-consuming and laborious task. This paper proposes an interactive biology-based flower modeling and animating approach. It models the initial shape of the floral components including petal, pistil, stamen and pedicel,and two terminal status of floral blossom with a sketch-based interface. The subtle geometry of the whole flower is created according to the phyllotactic rules. Then, it extracts a set of growth parameters for describing the floral blossom, and builds a dynamic growth model to regulate the continuous morphing of floral components in the process of blossom. Finally, a sequence of naturally deforming flower models is generated with these parameters.The initial experimental results demonstrate that this approach can efficiently generate visually pleasing simulation of floral blossom, which is consistent with biological rules.