An L-system or Lindenmayer system consists of a grammar and an interpreter. The grammar contains an axiom, usually a short string, that the grammar expands into a long, complex string. The interpreter then renders the string into an object. The first use of L-systems was to provide morphological models of plants. In this exploratory initial study we use an evolutionary algorithm to evolve interpreters for L-systems. The interpreter is a graphics turtle. For a given L-system the evolutionary algorithm tunes the turtle's parameter to cause it to drive in a constrained area of the Cartesian plane. Multiple L-systems and planar regions are given. In some cases a startlingly small number of optima are located indicating a relatively simple fitness landscape.