Grieve had an extensive herbal garden in Chalfont St. Peter, and during World War 1 she trained people in the harvesting, drying and preparation of medicinal herbs, to help remedy the shortage of medicinal supplies. In this effort she started publishing informative pamphlets.
To meet a large demand for information on herbal medicines during the First World War, Mrs Grieve started publishing pamphlets on the cultivation of herbs and uses of herbal medicines. These pamphlets were highly regarded by her peers and were eventually published.
Grieve's work "A Modern Herbal" was published in 1931 (ISBN 0-486-22798-7). The book contains medicinal, culinary, cosmetic and economic properties, cultivation and folklore of herbs from all over the world. The book is still in print and is available online.
A Modern Herbal was conceived by its editor Mrs. Hilda Leyel and based on monographs of English herbs written by Mrs. Grieve. Mrs. Leyel added American herbs to Mrs. Grieve's monographs and checked and edited the whole work. Hilda Leyel was the founder of the Society of Herbalists and for many years its Director. She was instrumental in the re-establishment of herbal medicine in Britain in the 1900s. She was also a practicing herbalist herself.
She also wrote Culinary herbs and condiments and Roses and pot pourri: Plants of sweet scent and their employment in perfumery.
Her collections and pamphlets are held by the Special Collections Division of the Edinburgh University