This science experiment for kids explores plant growth and teaches students about root systems by growing beans on cotton balls.


  • Glass jar or bottle
  • Cotton wool balls/wads
  • Dried beans


  • Discuss what plants need to grow, the purpose of leaves and how plants absorb water. Students can also explore plant life cycles and root systems.
  • Stuff cotton wool balls into the glass jar.
  • Then, stick one bean on either side of the jar in order to watch two beans growing at once.
  • Water it until the cotton wool is damp but not too wet, and place the jar in the window.
  • What happens after three days? One week? Two weeks? Have students observe, measure and record the beans growth over time.