A Modern Herbal: The Medicinal, Culinary, Cosmetic And Economic Properties, Cultivation And Folklore Of Herbs, Grasses, Fungi, Shrubs And Trees With All Their Modern Scientific Uses by Mrs M Grieve F.R.H.S.
After the war, she wrote over 300 pamphlets or monographs of individual plants. These were edited by Hilda Leyel and became the main source of information for the book, which was published in 1931, when Maude was 73.
You should be able to find this book on second hand book seller sites.
Plant Folklore
You can get this second hand from here