Permitted business uses may display automobiles, garden and lawn supplies and equipment, trees, shrubs and Christmas trees intended for sale on the premises outside of and adjacent to other principal structures in which such use is carried on provided that such outdoor selling or storage areas shall not encroach upon any of the required landscape or buffer areas, or the public right-of-way. The combined area of the lot occupied by buildings, required off-street parking, storage and display shall not exceed the maximum lot coverage permitted for buildings, parking and drives permitted within the district in which it is located. The areas shall be appropriately set forth at the time of application for a building permit or site plan approval. Any subsequent establishment or relocation of such areas shall be subject to the issuance of a supplementary approval. Nothing in this section shall be construed to permit the outdoor storage of goods intended for use other than at the point of sale.