Free resources to supplement your study of plants, flowers, and trees, including interactives, free readers, and virtual forests and trips.
Start with Dig Deeper soil science site which offers free booklets, experiments and games.
Kids Gardening: Free lesson plans and activities.
Here are some free garden exploration units for grades 1 - 4. Each unit - Pondering Plants, Soil Stories, Garden Pollinators, and Garden Habitats - includes six lessons.
The Great Plant Escape - Presents information in six "case files" so that kids can solve the mysteries of plant life. Covers: parts of plants, life cycle of plants, soil, seeds, and plant reproduction. Each case file has several hands-on activities or experiments that can be done.
To study plant processes, check out this interactive doc on photosynthesis and cellular respiration:
Photonsynthesis Videos: From NeoK12; also has links to quiz games and puzzles
Plant Reproduction: from Glencoe Life Science; 32 pages
Microorganisms: Text and interactives that teach about fungi and algae
Take a walk in the forest and ID trees using this dichotomous key.