I discovered Lois Hole many years ago and continue to use her books. The best part is she gives down to earth ideas and suggestions for cold zones. We are in Zone 3 in Montana and all of her suggestions work in our garden.
I know I have every plant with the exception of about 2 of them listed in this book.
I found Lois Hole's perennial book the best book I have on gardening. I like that she uses common names, but also uses the proper names. I started my flower garden about 10 years ago and didn't know much about growing perennials so her book really helped me learn. I also read alot of other books but still like Lois's books. I am from Canada so it helps me know what I can and cannot grow in zone 3.