Susun began her study of herbal medicine in 1965. Her areas of focus are: folkloric herbalism, eco-herbalism, ethnobotany, pharmacognosy, philosophy and psychology of healing, comparative religion, and women's health / spirituality. She is especially interested in altered states of consciousness as they pertain to learning, healing, birthing, and dying; and the role of plants in these states. Ms. Weed has four books in print (Wise Woman Herbal for the Childbearing Years; Healing Wise; Menopausal Years, The Wise Woman Way; and Breast Cancer? Breast Health! The Wise Woman Way) in English, French, Dutch, Japanese, and German. She is published in peer-reviewed journals (such as The Journal of Nurse-Midwifery), and was contributor to The Routledge Encyclopedia of Women's Studies. Ms. Weed writes a regular column for Sagewoman and Aspire magazines. She is featured in five professional videos (Weeds to the Wise, Menopause Metamorphosis, Chronic Problems the Wise Woman Way, Botany for Herbalists, and Hands-on Herbal Medicine).