Read "Making a Garden of Perennials" by W. C. Egan online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
It is useless to attempt to name and describe all the good perennials that may be grown, but there are some that seem to do well in all sections and it may be well to call attention to some of them.
"Anchusia Italica" -- Italian Alknet