One thing we used to do was planting a sunflower seed in a styrofoam cup that had we filled with potting soil and then watching it grow. The kids eventually get to transplant it to the yard when it's big enough and then watch it slowly get so big that it dwarfs them! Come to think of it, the whole exercise is sort of a metaphor for parenthood!
That's one of the things we planted! Such a good idea!
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