I have my sims grow the red berry bean because it's the most valuable of all garden plants, worth twice as much as the life fruit. The one herb I grow the most is sweet grass, which will cure nausea. I try to accumulate lots of it before I have my female sims get pregnant, or before I have a sim start doing alchemy, or anything else that might make them nauseated. If I have a sim going to university, I might grow wonderpetal for them, but I've found more recently that if I have them use the Multi Tab 6000 to listen to tabcasts related to their major, they don't need any other extra boosts to keep their academic progress high, so I don't used wonderpetal as much as I used to. I usually grow all of the coffee beans and herbs if my sims garden, but I don't actually use very many of them.