It is believed that there will be a significant demand for milk thistle in Europe and North America in the near future. Feverfew is one of the fastest selling plant products in the USA with a drug identification number for specific therapeutic applications. Europeans use feverfew preferentially to aspirin for treating migraine headaches. Feverfew is being currently grown commercially to a limited extent and its market demand is difficult to determine. Valerian is used to treat various ailments, mostly as an anaesthetic and as a calmative with no conceivable side effects.
Senega root has significant demand in Europe and Japan.
The importance for domestication of senega root is increasing due to the rapid depletion of the natural population through wild-crafting. Manitoba and Saskatchewan are the primary sources of senega root for the North American market. Some buyers prefer wild harvested root to commercially grown root. Comparison of transplanting and direct seeding on growth and productivity. Comparison of direct seeding and transplanting as influenced by harvest timing on growth, plant vigour, and productivity under irrigated and dryland conditions.