Jones, HuwKaandorp, Jaap2015-11-112015-11-1120001017-4656https://doi.org/10.2312/egt.20001031The tutorial introduces a variety of ways of modelling branching biological structures. Methods for generating plant like images, such as Diffusion Limited Aggregation and Iterated Function Systems are briefly discussed. The main concentration is on two methods that can be used to model the growth of such structures. The powerful Lsystems method gains explanatory power by use of parameters, context and environmental sensitivity, enabling natural features such as leaf drop, self-pruning and self-seeding. The method of Kaandorp for modelling marine sessile organisms such as sponges and corals, in which geometric features are “grown” directly, is compared for veracity with observed organisms in different physical environments.