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3D flower models are important components for impressive virtual reality environments. However, flowers’ leaves or petals are 3D free curved-surfaces and they are very difficult to model. We present a user interface with which the user can easily model flowers using freehand sketches. The user interfaces for generation, transformation, and copy are specialized to model leaves and petals, and thus it is more intuitive and flexible compared with rulebased modeling systems or library-based approaches.