Herein described is a post anchor apparatus and methods of use in erecting and anchoring posts in natural terrain. The apparatus of the present invention provides a convenient means of erecting a post in natural terrain while also providing improved strength, stability, and durability to the post. The apparatus comprises at least a housing for receiving the base of a post, a rod, stabilizer element for stabilizing the apparatus within the natural terrain, and an auger blade for driving the rod into the natural terrain.