Structural elements of plastic; space frame units, not of plastic; structural plastic modules forming a load-bearing matrix; geotextiles; all the foregoing goods for use in the ground and in relation to horticulture, arboriculture, soil erosion control, and reinforcement of surfaces, including pavements; non-metallic linings for pits; non-metallic tree gratings, grids, grilles and protectors; non-metallic drainage structures for use in the channeling or collection of floodwater and stormwater; plastic conduits for drainage; plastic stormwater infiltration modules