A Philodendron Selloum or Tree Philodendron is native to South America, but also grows outdoors on the East and Gulf coasts of the United States. Indoors, the easy-care, self-heading Philodendron Selloum takes up a lot of space, often spreading 5ft. or more with 2ft.-3ft. leaves. The dark green, shiny leaves are large and deeply lobed. A Selloum does grow a trunk as it matures, but the huge drooping leaves usually hide it.