[Herbs thread closest subject heading I could find ont' forum for a question re hemp.]
I've started to go fishing & came across hemp seed as a baiting option - say £7 per kilo for whole seeds. Despite nausea of officialdom doing grower checks and £580 growing license (it seems), I reckon a hectare's hemp planting for seed production for fish bait or bird feed could produce several £k p.a. (I haven't worked out manual versus combine harvester harvesting yet though !)
Anyone doing this already ?