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.
Working 5 to 9 .... Math and Science: Science Foldables and Journaling Finally! A fabulous hands-on way to teach erosion and why trees and plants are so important to the process of keeping soil in place. Whew!