Is pressure-treated wood safe for planters?

Modern treated lumber with ACQ preservatives is considered safe for ornamental planters. For edible plants, use naturally rot-resistant wood like cedar.

How do I prevent rotting?

Use rot-resistant wood, line the interior with landscape fabric, ensure good drainage, raise the box off the ground, and apply sealer annually.

What size planter should I build?

For flowers and herbs, 8-12 inches deep works well. For vegetables, go 12-18 inches deep.

beginner

2-3 hours

$30 - $80

How to Build a Planter Box: Simple DIY Raised Planter (2026)

Reviewed by Lumberama's Building Projects Team

|Last updated May 26, 2026

Wooden planter boxes add warmth and greenery to any deck, patio, or garden space. They are one of the simplest woodworking projects and produce results you can enjoy every day. This guide shows you how to build a durable, well-draining planter using rot-resistant lumber.

Key Takeaways

Wooden planter boxes add warmth and greenery to any deck, patio, or garden space.
They are one of the simplest woodworking projects and produce results you can enjoy every day.
This guide shows you how to build a durable, well-draining planter using rot-resistant lumber.
Use naturally rot-resistant wood like cedar for planters.
Avoid pressure-treated lumber for edible plants.

Tools Needed

miter saw or circular saw, drill/driver, tape measure, speed square, clamps, sandpaper, paintbrush

Materials List

1x6 or 1x8 cedar boards, 2x2 cedar corner posts, 1x2 trim, exterior screws, wood glue, landscape fabric, exterior wood stain or sealer

Step-by-Step Instructions

Cut the Components

Cut 1x6 or 1x8 boards for sides and ends. Cut four 2x2 corner posts to desired box height.

Assemble the Sides

Attach side boards to corner posts with exterior screws, stacking boards to build up wall height.

Build and Attach the Bottom

Cut boards for the bottom with 1/4-inch gaps between them for drainage. Attach to bottom edges.

Add Trim and Feet

Install 1x2 trim around the top edge. Add small wood blocks or rubber feet to the bottom.

Line and Finish

Line interior with landscape fabric. Apply exterior wood stain or sealer to all exterior surfaces.

Recommended Species

Western Red Cedar, Redwood, White Cedar, Cypress

Recommended Sizes

1x6 or 1x8 sides, 2x2 corner posts, 1x2 trim

Pro Tips

Use naturally rot-resistant wood like cedar for planters. Avoid pressure-treated lumber for edible plants. Leave gaps in the bottom for drainage rather than drilling holes which can clog. Line with landscape fabric, not plastic. Raise the planter off the surface with feet.