This is an instructable on building a single light post planter. Scale up the supplies to build the number of Texas light posts necessary for your project.
Half-barrel "whiskey" planter (from local Depot)
Pressure treated 8 foot 4x4 fence post
Pressure treated 4 foot 2x4
2.5" exterior wood screws
Liquid Nails (optional)
2 bags of landscape rocks
2 bags of potting soil
Plants of choice
Step 1: Cut 2x4 Bracing
We mocked the braces up first with some scrap cardboard to ensure a good fit. Rough measurements for each brace were 10" along the top of the 2x4 and 9 1/4" along the bottom. The 3/4" difference matched the angle of the tapered planter just right.
Step 2: Assemble the Post, Bracing and Planter
Since the post will cover the weeping hole on the bottom of the planter, we first drilled three smaller holes for drainage.
Place the post in the center of the planter and start sliding the 2x4 bracing in on each side of the post. Use a level to make sure your post is perfectly vertical before securing with screws. Attach each brace to the post with a toe-screw. Then secure the braces to the planter with a screw on each side of the metal band that holds the planter together. Finally, lay the whole assembly over and secure the post to the bottom of the planter with a couple of screws.