Been thinking about what it is that makes robot harvesting difficult. Part of the problem is picking up the cut leaves.
By growing vertically that harvesting could be easier, using a relatively cheap robot arm with scissors and a bucket
(above from Micropede)
You’d need to move the arm around, possibly using Tslot as rails
And a kind of trolley to mount the arm on, moved along by a stepper motor. You could provide 12v through the rails.
You could then raise or lower the arm on a platform supported by threaded bar (Like a big 3D Printer)
The vertical and horizontal motion could be done with Vslot belts