An urban planter box does not have one fixed weight. Estimate it as: total weight = empty container weight + soil volume in liters × wet soil bulk density. Wet garden soil commonly weighs about 1.3–1.6 kg/L (roughly 80–100 lb/ft³); clay-heavy or saturated soil can be heavier, while lightweight potting mix can be lighter. For example, a 100 L planter with wet garden soil holds about 130–160 kg (290–350 lb) of soil. Add 10–30 kg for a wood or plastic container, so the filled box may weigh about 140–190 kg (310–420 lb). A small 40 L balcony planter could total 60–80 kg, while a large 250 L planter can easily exceed 350–450 kg. Always include drainage, plants, and accessories, and check the load capacity of balconies, roofs, and floors.
How heavy is an urban planter box once it's filled with wet soil?
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