Things to consider ENGINEERING: “ If you are thinking about something permanent, structural, or even substantial pots, you need professional advice, ” advises Georgia Harper of Georgia Harper Landscape Design. “ Most residential rooftops are not designed to hold structures ol any substantial weight. ” ACCESS: Access is often an issue. Georgia says you should ask yourself how you will get the plants, pots, materials, features etc to the space. Outdoor design ideas Is there easy access? IMPACT OF ASPECT: Elevated spaces are generally windier, hotter and less protected than other types of gardens so careful consideration needs to be given to the plant types that will best thrive in these situations, as well as furniture and structures that may be impacted, ” adds Georgia.