The cactus thrives in the desert while the fern thrives in the wetland. The fool will try to plant them in the same flowerbox. The florist will sigh and add a wall divider and proper soil to both sides. The grandparent will move the flowerbox halfway out of the sun. The child will turn it around properly so that the fern is in the shade, and not the cactus. The moral of the story?Kids are smart.