This works great with the clear containers. Put two to four cotton balls into the container. Tuck in about a few seeds between the cotton balls and the outside of the container, so that you can see them.
Large seeds work best.
Peas, Cantaloupe, etc. Add a few drops of water, just until cotton balls are damp, but not soaked and not enough to puddle water on bottom of container. Use a screw eye with a medium size eye on it and screw it through the center of the lid. Put the lid on the container tightly. Braid three pieces of yarn long enough to go around the child's neck and slip over the head.