OSU Study Confirms: Wolmanized® Outdoor® Wood Treated with Wolman® E Copper Azole Type C (CA-C) is Safe for Raised Bed Gardens

A newly released study from Oregon State University’s College of Agricultural Sciences confirms that Wolmanized® Outdoor® Wood treated with Wolman® E Copper Azole Type C (CA-C) is safe for use in raised bed gardening.

This long-awaited recently published research addresses common concerns about using pressure-treated wood near edible plants. The results are clear: CA-C treated lumber does not pose a risk to soil health or to the safety of garden vegetables.

🧪 Highlights from the OSU Study:

• Low Soil Impact: Testing showed that only trace amounts of copper migrated from the treated wood into surrounding soil—well below safety thresholds set by regulatory agencies.

• Safe for Vegetables: Plants grown in beds made with CA-C treated wood absorbed no harmful levels of copper and were found to be completely safe for human consumption.

• Durability + Safety: The Copper Azole Type C preservative used in Wolmanized® Outdoor ® Wood has been innovated to bind tightly to wood fibers, meaning it resists leaching and maintains structural integrity for years.
  

📌 From the researchers:

“Based on our findings, Copper Azole Type C treated wood is a safe and effective material for raised bed gardening when used properly.”

— Oregon State University, College of Agricultural Sciences

🌿 What It Means for Gardeners: Gardeners looking for long-lasting, rot-resistant materials for raised beds can now choose Wolmanized® Outdoor® Wood treated with Wolman® E Copper Azole Type C (CA-C) with confidence. It’s not only durable and affordable — it’s now backed by independent university science.

There’s no need to avoid treated lumber when building vegetable beds, as long as it’s CA-C treated wood and used according to standard gardening practices (e.g., good drainage, clean soil, no direct food contact).

Wolmanized® Outdoor® Wood treated with Wolman® E Copper Azole Type C (CA-C), available from Conrad Forest Products, complies with AWPA standards and now carries the reassurance of OSU’s 2024 findings. Grow with confidence. Build to last.

🌱 Wolmanized® Outdoor® Wood treated with Wolman® E Copper Azole Type C (CA-C) – Tested. Trusted. Safe.