Mammoth Venus Fly Trap is a new variety, named for its large-growing traps. Since Mammoth is a hybrid created from three of the largest varieties, it's no surprise that the traps will grow to exceed the size of the traps on a regular Venus Fly Trap. You can grow this plant indoors or outdoors with great success as long as you provide bright light and a steady supply of distilled or rainwater in a shallow saucer underneath.