English: Berms of fava beans have been planted at Hayes Valley Farm, a community-built farm on the former Central freeway ramps of San Francisco. After the Loma Prieta earthquake of '89, the lot between Oak Street, Fell Street, Octavia and Laguna, was vacant for 21 years before the City authorized the site for interim use. The farm is a permaculture demonstration site, and all the soil has been upcycled from the urban waste stream. The farm has used 1,000 cubic yards of horse manure, 2,000 cubic yards of woodchips, and 100,000 pounds of cardboard to cover over an acre of its 2.2 acre lot.