Herbivory at marginal populations: Consequences for maternal fitness and vegetative differentiation

► Antagonistic interactions can vary in marginal populations of plant species. ► Geographic variation in vegetative traits could be promoted by herbivores. ► Marginal and core populations did not differ in their herbivory level. ► Herbivory affected differentially on maternal fitness in marginal populations. ► Geographic variation in vegetative traits and in phenotypic selection did not fit.