While defending against herbivores, plants also interact with neighbouring plants. These neighbours compete for light and nutrients, but may also affect the likelihood of herbivore attack on a focal plant. Induced defence responses to herbivores also affects growth parameters and plant physiological machinery for defence and response to light interact. How dynamic processes of plant-plant-herbivore interactions and in particular the role of induced plant responses is played out on a spatial scale is still poorly understood. I study how dynamics of plant-plant-herbivore interactions shapes plant growth-defence strategies.