Perennials — Audiobooks
Hardy Perennials and Old Fashioned Flowers Describing the Most Desirable Plants, for Borders, Rockeries, and Shrubberies.
by J. G. (John George) Wood
Stauder
by G. N. (Gudmund Nyeland) Brandt
A woman's hardy garden
by Helena Rutherfurd Ely
Making a garden of perennials
by W. C. (William Constantine) Egan