Man properly tending his garden. Original image sourced from US Government department: Public Health Image Library, Centers… Free Photo from public domain license 
Poppy field in the native plant gardens that surround the main auditorium building at NASA Ames Research Center, Moffett… Free Photo from public domain license 
The fruit grower's guide : Vintage illustration of canning, jars, metal top, rubber Free from public domain license 
Flowers at the Desert Botanical Garden. Original image from Carol M. Highsmith’s America, Library of Congress… Free Photo from public domain license 
Vintage illustration of corer, mayfarth's apple parer, slicer digitally enhanced from our own vintage edition of The Fruit… Free from public domain license 
A black swallowtail butterfly enjoys a snack from a blooming lantana plant at Merritt Island National Wildlife Refuge in… Free Photo from public domain license 
Cabbage, Brassica oleracea (1596–1610) by Anselmus Boëtius de Boodt. Original from the Rijksmuseum. Digitally… Free from public domain license 
Poppy fields. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced by… Free Photo from public domain license 
Spring Wisteria. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced… Free Photo from public domain license 