As an herb grower, I've noticed that the herbs that are in demand (and most useful to me personally) are the ones that don't have benefits that are also available from drinks. I grow mostly hairball and rubeweed, with a bit of silvertongue (and of course purple, because it's fun).
I have a few ideas for new herbs:
Batterbulb: Batterflies will slow down and swoop downward to be in reach, making it easier to feed them. The effect could be called "Dances with Batterflies".
Pignip: You get a higher mood bonus from pig interactions (because they behave more amusingly). The effect could be called "Hog Wild".
Chickweed: You don't startle chickens while the effect lasts. Possible name: "Chicken Whisperer".
Lepidowort: You use significantly less energy when singing to butterflies (this would be especially great since the gurly drink does NOT remove the energy cost of butterfly singing). Maybe call it "Buttery Voice".