Another project of mine - sorry it seems a bit off topic as I'm not building it, just thinking of doing it... Larger farms will have one or two small houses for rent, intended for workers to help with the crop. If all plants are grown either on "shared unit" (if outdoor rooms can be assigned to a unit) or on ground not in any unit, tenants should be able to weed, water and evolve, while the landlord will be the one harvesting/selling. Perhaps there will be small plot where tenants can grow their own stuff, or they can be allowed harvesting one plant per day etc. It should be quit easy to administrate and the work could mean lower rent. It all depends on who has access to what area etc.
