From the Super Mario Wiki, the Mario encyclopedia
Ashley tries to create the Monster Flower after reading about it in a book. Red turns into a wand and Ashley uses him to zap a potted sapling, which causes a simple flower to grow. Chatty Mr. Spell Book soon comes in and, after a bit of time, teaches Ashley how to properly summon the Monster Flower. When she zaps a second potted sapling, it grows into the Monster Flower. It soon starts to overtake Ashley's house, growing large enough for its head and tentacles to burst from the house's sides. Though Red is terrified by the Monster Flower, Ashley smiles at it.
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