Seeds are essential for food security and the continued existence of plant diversity. Industrial agriculture has reduced genetic diversity through monocultures and patented hybrid varieties, making small farmers dependent on large seed companies. F1 hybrids, which produce high yields, are not seed proof and contribute to genetic erosion, limiting the ability of plants to adapt to climate change and disease. Plant cycles are fundamental ecological processes, but many people lack an in-depth understanding of them. Studies show deficits among students, especially in classifying and explaining seeds and their role in a plant’s life cycle. Hands-on experiences, such as those made in school gardens, foster a better understanding and a sustainable connection to nature. Knowledge of biodiversity and plant cycles is crucial for topics such as healthy diets, regionality, and climate adaptation. Integrating this content into educational concepts contributes to the implementation of Education for Sustainable Development (ESD) and the goals of the Convention on Biological Diversity (CBD). A sound understanding of plant cycles through practical and theoretical approaches is essential to promote sustainable practices and the appreciation of biodiversity. The seed theme is a great way to address these issues, and the school garden is a great place to learn about it, as will be explained in this chapter.