Pick a spot to place your cast stone garden fountain. Many are self-contained and have a water pump that sits in the fountain pedestal that goes on top of the mount. Choose a location that is not near trees because leaves and other debris detract from the aesthetics by landing in the water.
Measure the pedestal or base of the cast stone garden fountain with a yardstick. For the most attractive look and stability, choose a pavestone or solid stone block that is two to three times the diameter of the base.
Lay the pavestone or block mount in the area you want to place the fountain. Outline the area with stakes or other markers and remove the stone.
Dig a hole with a small garden shovel for the pavestone or block. Do this in the same depth and dimensions as the stone. This allows the mount to be on the same level as the ground and adds stability.
Set the pavestone or block in the space you dug. Push the excess soil firmly along the sides of the stone to make the mount more secure. Continue installing your cast stone garden fountain according to the instructions.