So I know green houses work and everything. I have one attached to my sims house. Ceiling is glass and windows all around. They show that they are sheltered and they are tended to daily. I fertilize t...
Try getting bees. These pollinate nearby plants increasung their quality faster. Once they're ready, just click on the plant and choose Evolve. I think the plants' quality increases slowly because before Seasons expansion pack plants had 10 qualities. Now they have 5.