We actually ended up using Model Magic (air-dry clay) instead of playdough because I wanted to let it dry and then flood the river (since we were discussing how the flooding of the Nile made the land fertile). I set out a container of whole cloves and showed the girls how to stick them into the clay. The cloves smelled wonderful, and both of the girls enjoyed putting them into the clay one by one to 'plant their crops'. E worked especially diligently on this activity and told me that it was "so much fun" when she was done.
L also used the cloves to decorate a cake: