You can grow these types of plants indoors as tabletops or floor level, and you can also grow outdoors as few varieties of philodendron can reach up to 15-20 feet.
The self-heading types grow from a clump at the base. Their leaves are spaced so close together that the stem is not visible until some of the older lower leaves fall off.
Self-heading philodendrons are described as being arborescent types (resembling a tree in growth or appearance).