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Foodwall™ requires a solid and level surface to ensure water is evenly distributed through all growing tubs.
The wicking bed should be located on a clean, level surface free of sharp rocks or protrusions. Preferably, the base should be a 20mm layer of blue metal stone, not clay. Extend the base to 150mm beyond the planter base to prevent rodents from burrowing under and erosion.
Wash the sides of the beds 6 monthly to remove any dirt splash from the rain as this may lead to premature failure of the galvanized surface.