Gardening for a Lifetime is so good (and so apropos(sp?) for me) that I finished it in 2 evenings. Sydney Eddison's basic thrust is to help people figure out how to cut down on the size of their gardens- this is a book for plantaholics. As I remember it , and I read it a couple or three days ago: get rid of alot of different perennials- especially ones that aren't pretty for 3 seasons. Get more shrubs. Keep Sedum 'Autumn Joy', Siberian Iris, old fashioned German Iris, Peonies, Nepeta, grasses, Amsonia. Accept imperfections such as slightly messy edges, slightly shaggier plants, meadows rather than gardens. Get help. When you can't manage your garden, get rid of it (accept defeat). Accept change- particularly that as the trees all get bigger, there will be less sun but shade gardens are less weedy.
In any case, her writing is delightful even though the subject is a little sad.