Science for Kids: Planting and Growing Seeds and Kitchen Scraps with Kids in Preschool. Perfect for learning about how things grow at home or in the classroom. Get your kids excited about science with these fun activities! - Pre-K Pages
What you'll need One 9- or 12-ounce plastic cup 1 to 1 1/4 cups of potting soil 1 tablespoon of grass seeds (we bought rye grass at a garden center) Decorations, such as office dot stickers, markers, and ribbon (for safety, it should measure less than 6 inches long) http://spoonful.com/crafts/plant-pals
Grow a Lima bean in your window. While this is not really a craft project, it will still be something fun for the kids to do. Once the bean starts growing the kids could always paint a nice pot to plant it in.