This is a fun project for the indoor gardener who has little space for conventional flowerpots and window planters.
You will need:
Five x 2l PET bottles
Five x airline tubing connectors
Fishing line
Eight x plastic washers
S–shaped hook
Four x 3in diameter net cups
Hydroponic soil
Four x 1in sponge cubes
Airline tubing
Aquarium water pump
Six feet of flexible tubing
Silicone sealant
Drill, 1in whole saw, small drill bit
Cutter knife
Drill holes in the bottom of four of the PET bottles with the holesaw, cut a large oval in each bottle a third of the way from the bottom.
Using the small drill bit, drill two equidistant holes above the oval. Drill a hole in each bottle cap.
Push the airline tubing connectors into the caps and glue in place with the silicone sealant. Place a piece of sponge in each cap, screw onto the bottle, cut a short length of the airline tubing and attach to the ends of the connectors.
Assemble all the bottles so that the bottom is facing up and the cap is securely in the hole of the bottle below it. Using the fishing line and washers, connect the bottles to each other, starting from the bottom.
Cut a hole in the side of the reservoir bottle large enough to fit the pump’s inlet. Push some of the plastic hose through and glue in place using the sealant. Connect the flexible tubing, hang the bottles by the s–hook and connect the last bottle to the reservoir by a piece of airline tubing. Fill the reservoir and test for leaks.


