Fill a clear plastic cup ¾ full with potting soil. Plant any nonpoisonous plant cuttings in the soil. Make sure to cover the roots well. Water lightly. Tape a second cup on top of the first so that the mouths of the cup touch each other. Place in a area where the cups can easily be seen by the children and also get sunlight. As the water in the terrarium evaporates, it condenses on top and then rains back down to the plant. If you leave it, adding water occasionally you can grow small plants in this rain forest Put small plants in an aquarium during Rain forest week and let the children view a "real" Rain forest Everything Preschool >> Themes  >> Rain Forest >> Science