So long as the roof bears the weight, then what about the fibre clay/leadlite ranges, in cubes or cylinders. Light, very smart and complement so many plants. Widely available
My first thoughts are also about the load bearing capacity of the roof. Large pots will be extremely heavy when full and standard joist for a flat roof aren't designed to support that sort of weight.
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So long as the roof bears the weight, then what about the fibre clay/leadlite ranges, in cubes or cylinders. Light, very smart and complement so many plants. Widely available
H-C
My first thoughts are also about the load bearing capacity of the roof. Large pots will be extremely heavy when full and standard joist for a flat roof aren't designed to support that sort of weight.
Or did you mean what to put in them?