The term 'Planted Pet' can be solved by the four-letter word CHIA. CHIA is a type of flowering plant native to Mexico and Guatemala, and is a member of the mint family. It is grown for its edible seeds, which are high in omega-3 fatty acids, fiber, and antioxidants. CHIA seeds are often used as a topping for salads, yogurt, and smoothies, or as an ingredient in baked goods. They can also be sprouted and grown as a houseplant, making them a popular choice for those looking for a low-maintenance pet.