Not only is the density of host plant crucial for a favorable habitat, but also the height of the sward, the expanse of grass covering the area where "E. aurinia" lives. Sward height that is too short can lead to increased exposure of the larvae to predators and can cause limited food availability, leading to starvation. However, if the sward height is too tall and densely packed, then it becomes difficult for adult butterflies to locate the host plant to oviposit on. Thus, the level of sward height is most optimal when it is medium height.