I took over Arbakooh and found out that the Baratak have been poisoning their own world by building a large number of factories. Ironically, the Precursor Nanites improvement (which buffs manufacturing when upgraded) was left untouched. They also had a number of (probably redundant) prison-like structures, leaving me to wonder what kind of North Korea these seemingly benign plants inhabit. (I'm guessing the prisons are where they jail people for Tree-son. )

I took a screenshot but *cough* messed it up, so you'll just have to take my word for it. My guess is that because the Baratak inhabit a foresty planet with lots of manufactury tiles, the virtual intelligence decided it would be a good idea to build factories???