Beginning with an introduction to the scientific method, several experiments explain how and why plants grow as they do.  Investigations include how seeds sprout, how plants take in water, the importance of sunlight in growth, both above and below ground, and how pine cones release seeds.  Each experiment starts with a hypothesis, contains a step-by-step procedure, examples of charts to record observations, and an explanation of what happened.  These experiments use items easily found at home.  Instructions are easily read and many large photographs accompany the text.  Books for further reading are written at a similar reading level.  Glossary, index, and websites included.  Other books in the series are experiments with: liquids, magnets and metals, rocks, and soil.