Science project for toddlers
A great way to get toddlers involved is to do a project with them. If you can get a clear glass big jug (like a pickle jar from a local pizza place). Fill it with some soil and add some seeds (carrot and potato work well) and let them water it and take care of it so they can watch the vegetables grow. Once they are all grown they can have them to eat.
What a fantastic idea! I'll try that as soon as we finish our gigantic jar of pickle relish.