Is Senna farming profitable in dry areas and where is it sold?

Senna, the laxative herb, is genuinely suited to hot, dry, low rainfall areas like Jodhpur and Tinnevelly in the south, which is one of its strong points, since it tolerates drought and poor soils where many crops fail. The leaves and pods are the saleable parts, with demand from herbal, pharma and export channels. There is an established trade for Senna, more developed than for some other medicinal crops, but prices still vary by year and quality, and there is no fixed mandi guarantee. So confirm a buyer or known trader and a price before scaling up. It can be a sensible dryland crop because it needs little water, but verify current demand and price locally. Get any buyback or contract terms in writing and confirm the buyer is real before relying on them.