Measure and cut 44 inches off of one beam. This will be the cross bar that holds the plants.
Measure and cut two angled supports. These should be cut at least 12 inches long with 45-degree-angled ends. You can make them larger or smaller, depending on your preference. Just make sure they don't extend out to where you will hang the plants.
Screw the 44-inch beam on the top of the longer beam to make a T and then screw the support beams into the post and the cross beam.
Paint or stain the wood as desired.
Measure and mark the location where you will hang the plants and insert the hangers.
Dig a hole that is 2 feet deep.
Lay gravel at the bottom of the hole 3 inches deep.
Pout concrete into the hole.
Center the post in the hole and allow to dry overnight.
Hang your plants on both sides.