Mini greenhouse
Recreate the story of Jack and the Beanstalk in a cup! Create your own mini-environment and grow some alfalfa, while finding out what plants need to survive. This is one of the many science demonstrations performed by the Questacon Science Squad in the Sydney metropolitan area. Find out more at sciencesquad.questacon.edu.au
Yep Fishman, you could use seedling compost or , save on tape, dip finger in some vaseline run it along top edge of cup, when you place the other cup on its all sealed.
can you use dirt