This study investigates how storytelling, when designed according to principles from variation theory, can support students’ understanding of pollination within the life cycle of flowering plants. The research was conducted in four grade 4 classrooms with contrasting student demographics and is grounded in a subject-specific didactic framework that integrates variation theory, sociocultural perspectives on language, and narrative structures as cognitive tools. The aim was to examine whether narrative-based teaching could help students discern four critical aspects of pollination: the structure of the flower (including stamens, pistils, nectar, and pollen), species-specific pollen transfer, the diversity of pollinators, and the formation of seeds as a result of pollination. Data were collected through written and visual pre- and posttests as well as semi-structured group interviews. A variation theory analysis was applied to identify differences in students’ conceptual expressions before and after teaching. Results show that many students progressed in their understanding, particularly in articulating the link between pollination and seed formation. The use of stories, combined with targeted variation and guided discussions, helped make critical distinctions visible and supported students’ ability to integrate multiple aspects of the process. Oral expressions during interviews often revealed a deeper understanding than written responses, especially in linguistically diverse classrooms. The findings suggest that variation-informed storytelling can be an effective strategy to support conceptual development in science education. By making biological processes more accessible and engaging, this approach may offer valuable guidance for designing inclusive and meaningful teaching practices.