The major holdings in the Ethel Zoe Bailey Horticultural Catalog Collection are from
American companies. Since the early decades of the 20th century, the number of seed
and nursery businesses in this country has steadily declined as smaller companies
serving a particular region have given way to larger, well-funded companies able
to advertise and ship nationally.
In their research for Hortus (the standard reference for plants cultivated
in the U. S. and Canada), as well as other writings, Liberty Hyde Bailey and his
daughter depended on the catalog collection for current information on what plants
and seeds were available.