The limited historical documentation available from the
California Department of Food and Agriculture was supplemented
with archival catalogs. We located two nursery catalog collections
in the region: (1) Collection of Nursery Catalogs (Collection 1207)
in the Department of Special Collections located in the Charles E.
Young Research Library, University of California, Los Angeles, and
(2) the collection of catalogs available at the Los Angeles County
Arboretum and Botanic Garden Library. (3) The 2009 and 2011
catalogs of West Covina Nurseries and Monrovia Nurseries, both
large and well known nurseries in the region, were accessed on the
company’s websites respectively (Table 1). We exclusively utilized
catalogs of nurseries located in Los Angeles County.