“Animation of plant development” by Prusinkiewicz, Hammel and Mjolsness

This paper introduces a combined discrete/continuous model of
plant development that integrates L-system-style productions and
differential equations. The model is suitable for animating simulated developmental processes in a manner resembling time-lapse
photography. The proposed technique is illustrated using several
developmental models, including the flowering plants Campanula
rapunculoides, Lychnis coronaria , and Hieracium umbellatum.

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