"entails the regulation of , cell expansion, and , and patterning of the organ as a whole. s are ideally suited to dissecting these processes. Petals are dispensable for growth and reproduction, enabling varied manipulations to be carried out with ease. In ', petals have a simple laminar structure with a small number of cell types, facilitating the analysis of organogenesis. This review summarizes recent studies that have illuminated some of the complex interplay between the s controlling petal specification, growth and differentiation in Arabidopsis. These advances, coupled with the advantages of using petals as a model , provide an excellent platform to investigate the underlying mechanisms driving plant organogenesis."