This is the absolute "bible" for southern herb growing. These two ladies owned a restaurant/garden center for herbs for many years in Round Top Texas...it was destroyed by a tornado many years ago. They are frequent speakers at the Antique Rose Emporiums Fall Festival in Independance Texas.
The absolute best reference for growing and using herbs in south central Texas ( and in other places, but I am only acquainted with the TX part). The mother and daughter duo founded Hilltop Herb Farm near Cleveland,TX where they grew and harvested herbs, created herbal products and had a mail-out service. Both authors have been speakers on herbs for years. Madalene Hill has been the president of the Herb Society of America.