Natural Wood Rectangle Planter Box With Plastic Liner, 5" x 28" x 4" (Wholesale 6 PCS/Case) $129.60. WPCB053404. Pack of 6. Natural Wood Rectangle Planter Box With Plastic Liner, 5" x 34" x 4" (Wholesale 6 PCS/Case) $173.40. WPCB051704. Pack of 12.. Cut the 1x4 cedar board into pieces that are a few inches smaller than your planter boxes. You'll need two for each box. Then adjust your table saw angle to 45 degrees, and cut the edge off both pieces. Attach one piece to the back of the planter box with the point facing down and away using 1 ΒΌ" exterior screws. Planter - Standard Rectangle. 40 10th Ave - Manhattan NY. Connect Edging System. View All Projects. test. Request a Quote. Get an estimate based on the planter styles and sizes you envision OR send us your site plans and we'll get started on a customized proposal. Build a Quote. "/>Rectangle planters