I know that green-thumb sims have this interaction. In Sims 2, you could take any plant to top quality by talking to it. I'm not seeing any benefit from it in this game. Am I missing something?
I did see a plant grow faster than another, sprouted the same night into a full bush, after my sim talked to it and another plant was ready to evolve sooner than others. It also raised the sims gardening skill.