Science Day: Grow a tree from a pit

Science Day: Show your child how a pit can make a tree. Buy an avocado. After eating it save the pit. Wash pit and put toothpick in the middle of it. Put pit in a glass of water. After about a month when pit grows a root plant it in coffee tin filled with potted soil. Don't bother rising out tin. A little coffee in the soil is fine. Keep soil moist, but not soaking. When plant is too big for tin plant in backyard.