Abstract: In-ground container installation apparatuses may include a housing support frame. An apparatus housing having a housing interior may be resiliently carried by the housing support frame in a plumb and pendulum configuration. The housing support frame may be mounted for axial displacement between a mixing position and a digging position with respect to the apparatus housing when the apparatus housing is in a stationary position. A drive motor may be provided on the housing support frame. An auger blade assembly may be drivingly engaged for rotation by the drive motor. The auger blade assembly may be disposed in the housing interior in the mixing position of the housing support frame and extend from the apparatus housing in the digging position of the housing support frame. Auger blade assemblies for driving engagement by a drive motor of an in-ground container installation apparatus are also disclosed.