OK, so I've got them in my plugins folder, fire coverage, water supplied, a nearby park, enough regional industrial capacity, and high demand, but I can't seem to grow any farms beyond stage 3! Anybody know of any mods that would cause this? I don't have any of the inCAMpatible mods listed in the cleanitol file.
Stage 4 farms require a certain regional industrial capacity.
Make sure you've got your city connected to neighbouring cities where you've allowed ID, IM or IHT to grow.
Stage 4 farms also require water. Thus make sure you're supplying water wherever you want them to grow.