A few weeks ago I ran across a neat little invention called "matchstick garden". It is a little book of paper "matches" that contain seeds on the ends. When planted, they grow into herbs or wildflowers (as specified on the packaging).
This is info from their website:
There are two styles of Matchstick Garden available, either four herbs or wildflower seeds already mixed on the end of each matchstick. The Mixed Herb Matchstick Garden contents Basil, Chives, Parsley, and Thyme. The Wildflower Matchstick Garden contains Cornflower, Shasta Daisy, Corn Marigold, and Field Poppy. Each matchbook is 3" W x 2" H with 10 matchsticks. Easy to follow instructions are printed inside. The Matchstick Garden a great party favor, stocking stuffer and surprising gift!
My preschool-aged son loves gardening, and I thought something like this would be a fun and manageable way for parents without gardening skills (myself included) to start growing with their children.