Material List

a plastic soda bottle (empty)

a piece of cotton string

sharp knife or scissors

hot piece of wire to make a role in the bottle lid

some dirt with seeds

    First empty the soda bottle, and cut it in two. Note that the bottom part should be bigger than the top part. Use the hot wire to make a role in the bottle lid. A small role will do. Pass the cotton string trough the bottle lid.

     Put the lid back in the bottle, and turn it upside down. Cut the cotton string and make sure its length is the same as the whole thing.

    Now you add the dirt with seeds. Make sure the cotton string is straight. Add water to the bottom part of the bottle, you do not want to put too much water in it. The water should not touch the lid.