How do you plant a three year old?

Well, I had this grand idea to have the kids help me in the garden so they could take some ownership in the growing of vegetables. After finally getting Gracie, Braden and Tanner to start making four different hills to plant Zucchini in (and keeping Gracie from screaming when Braden put dirt outside her circle that she continued to trace in the dirt, and redirecting Tanner when he took dirt from the hill...) we decided to plant. I firmed the dirt around the seeds and started visiting with my neighbor. Then I look and find Braden winding up with a GIANT kick to the mounds of zucchini we had just planted. Dirt flies EVERYWHERE and as I run to give him a little talking to he tries to run away by going through the broccoli and green beans I planted last weekend. ARGH. It will be amazing if anything continues to grow.