"Planting the Seeds of Science" is a new early childhood science resource developed through a collaboration between science/engineering academics, early childhood teacher educators and early childhood pre-service teachers, with funding from the Australian Learning and Teaching Council. Based on best practice early childhood principles, the resource was designed to allow teachers maximum agency through interpretation of information, flexibility in choice of learning experiences, and adaptability in modifying learning experiences. This approach to curriculum development acknowledges teachers as professionals, and that the teacher best knows their children and interests, the teaching context, the environment, and the outcomes they wish to achieve. This paper outlines the emergent development of the resource, and presents an evaluation through multiple case studies. (Contains 2 tables and 3 figures.)