EXIT: Puzzle - The Alchemist's Garden

Over the years, word has spread about your ability to get to the bottom of mysteries and solve complicated riddles. Now your journey has led you to this strange place: an abandoned villa. Since the owner of the house disappeared years ago, strange plants and animals have taken possession of the space. Then you discover a hidden garden. Will you find the answers you're looking for here? Solve the riddles and reveal the alchemist's secret!