Children notice seeds and plants every day. But do they really understand what seeds are and how they are related to plants? Have they ever observed what is inside the seed? What happens to the "things" inside a seed when it grows? What do plants need to grow, and what do they need to stay healthy? Through a sequence of three related learning cycles--exploring seeds, germinating seeds and monitoring plant growth, and devising plant experiments--third-grade students answer these and other questions about plant growth and discover that new seeds are made from the plants they grow. Though the activities in these learning cycles are not new, they are uniquely presented as connected learning experiences, with some cycles occurring simultaneously and various phases of exploration, concept invention, and concept application overlapping.