roof gardens <p><span data-sheets-value="{" data-sheets-userformat="{">Gardens, situated on rooftops, typically in urban areas above private houses or commercial buildings. The depth of soil is limited to keep the weight low and the plants are usually set in tubs or similar containers, but elaborate roof gardens have been constructed with small pools and beds.</span></p> <p><span data-sheets-value="{" data-sheets-userformat="{">Source: AAT </span></p> <p><span data-sheets-value="{" data-sheets-userformat="{"><a class="in-cell-link" href="http://vocab.getty.edu/page/aat/300008131" target="_blank" rel="noopener">http://vocab.getty.edu/page/aat/300008131</a></span></p>