Is pressure-treated wood safe for vegetable gardens?

Modern pressure-treated wood uses ACQ (alkaline copper quaternary) which is considered safer than older CCA treatments, but many gardeners prefer untreated cedar or redwood for food gardens.

How deep should a raised bed be?

At least 6 inches for shallow-rooted plants, 12 inches for most vegetables, and 18-24 inches for deep root crops.

How long do cedar raised beds last?

Cedar raised beds typically last 10-15 years depending on climate and soil moisture.

How to Build Raised Garden Beds: Complete DIY Guide | Lumberama

beginner

3-5 hours per bed

$50 - $200 per bed

How to Build Raised Garden Beds (2026)

Prepared by Lumberama's Building Projects Team

|Last updated May 26, 2026|Sources & methodology

Raised garden beds give you control over soil quality, improve drainage, reduce weeds, and make gardening easier on your back. They're one of the simplest woodworking projects and perfect for beginners. Using naturally rot-resistant lumber like cedar ensures your beds last for years without leaching chemicals into the soil.

Key Takeaways

Raised garden beds give you control over soil quality, improve drainage, reduce weeds, and make gardening easier on your back.
They're one of the simplest woodworking projects and perfect for beginners.
Using naturally rot-resistant lumber like cedar ensures your beds last for years without leaching chemicals into the soil.
Stack two or three boards high for deeper root vegetables like carrots and potatoes.
Line the inside with landscape fabric but never use plastic — roots need drainage.

Tools Needed

Drill/driver, circular saw, tape measure, speed square, level, shovel, safety glasses, clamps

Materials List

2x6 or 2x12 cedar boards, 4x4 cedar corner posts, 3-inch exterior screws, landscape fabric, garden soil, compost

Recommended Species

Western Red Cedar, Redwood, White Oak (do NOT use pressure-treated lumber for edible gardens)

Recommended Sizes

2x6x8 or 2x12x8 side boards, 4x4x12 corner posts (cut to height)

Pro Tips

Stack two or three boards high for deeper root vegetables like carrots and potatoes. Line the inside with landscape fabric but never use plastic — roots need drainage. Use untreated cedar for food gardens to avoid chemical leaching. Add a 2x6 cap rail around the top for a comfortable seat while you garden.