Two different methods for procedurally based modelling are presented as an alternative to the interactive modelling. Fractal and graftal techniques are shown to be the possibilities for modelling of natural phenomena as terrain shapes and trees. Different issues of consistency for fractal based terrain modelling are discussed. Second part of the paper shows several problems of graftal and L-systems trees modelling. Attention is focused on modelling of branches, the problems of "twisted" branches and branch connections are solved. The paper contains remarks towards the implementation of presented ideas.