Columbia subject headings:
Gardening--History.
Gardening--Social aspects--History.
Gardens--History.
Gardens--Social aspects--History.
Harvard subject headings:
Gardening--History
Gardening--Social aspects--History.
Gardens--History
Gardens--Social aspects--History.
Princeton subject headings:
Gardening--History.
Gardening--Social aspects--History.
Gardens--History.
Gardens--Social aspects--History.