First Lady Michelle Obama advocates gardening, healthy eating and exercise for all, especially for our children. See the Sesame Street youtube video, Michelle Obama's Healthy Habits, produced by Sesame Workshop. Other videos of interest are At The White House: Garden-To-Table Is Elementary and eHow's How To Start a Vegetable Garden.
Another interesting source to learn more about gardening with children is through Associated Content, an open content network. See their Three Vegetable Garden Projects Kids Will Love.
Notes from the Windowsill, an annotated bibliography of children's books enjoyed by adult readers, has a comprehensive listing of books for young readers and older adolsecent readers on gardening, both fiction and nonfiction.
No outdoor space to call your own? A list of San Francisco Community Gardens gathered by San Francisco Garden Resource Organization, SFGRO, might lead you down a garden path of renewed sense of appreciation for nature and living healthy.
So, get out there, wear a hat, use sunblock, and enjoy the fun and nutrition of growing your own vegetables. Mother was right, eat your vegetables!