What weight of canvas fabric is ideal for supporting soil in outdoor tree boxes?
When selecting canvas fabric for outdoor tree boxes, the ideal weight depends on the soil volume and environmental conditions. A heavy-duty canvas with a weight of 12-18 ounces per square yard (oz/yd²) is typically recommended for supporting soil effectively. This weight provides durability, prevents tearing, and ensures proper drainage while retaining soil structure. Lighter fabrics (under 10 oz/yd²) may not withstand the pressure of wet soil, while heavier options (over 18 oz/yd²) can restrict root growth. For long-lasting performance, choose UV-resistant, waterproof canvas to endure outdoor elements. Always consider reinforced stitching and grommets for added stability in larger tree boxes.
