This is a wonderful flower matching game. For preschoolers, this would need to be a small group activity instead of an individual activity so that reading help could be given to the child. This is a great way to re-enforce the parts of a plant.
Writing, painting and printing with carrots :: Easter crafts
Celery flower art is another great Mother's Day idea or just a simple art project for the classroom. I think the idea of using food to create art would be an interesting project to bring to the classroom and have students work with and experiment with.
Spring and flower science bulletin board idea: Love this growing plants display - very creative! Could do one main flower (sunflower) stem out of a pool noodle and students' art along with it- very cool idea.