Herbs and Spices are vast subject areas. One of the things I read about medicinal herbs early on in my research was the Rhubarb was used as a medicine and that is was carried out of China on camels. I tried to think about how that might look. Was is in pill form? Was it the whole plant dried? Was it the roots, stems or certainly not the poison leaves, right? What was it used for? Those thoughts went into the making of this work. Later I found out it was used as a laxative and an astringent.