I really love my bog house, although I still hope that there will be more attractive ones coming soon. But part of the appeal is that it's the only place for Herbalism.
There is just one problem though: the herbs suck.
Gandlevery: a +3 energy boost once every 15 seconds for 2 minutes (+24 total energy gain). Seriously? Growing it takes 1 hour 30 minutes. The boost should be bigger, or even better, relative to the user's total energy.
Hairball Flower: a speed boost. Barely noticable, in my humble opinion. 1.5 to 2 times the base speed would be cool. Maybe make the energy loss more painful, but that could be really useful!
Purple Flower: cool one-time experience, useless otherwise. Grows way too fast IMHO. Make it grow the slowest, make the others faster.
Rookswort: no mood loss for a bit. THAT one is useful. Keep it. Growing time is adequate, IMHO.
Rubeweed: improved chance for drops. Well, that one is dubious, I have not tested it extensively, but from my mining experience I notice next to no increase in gem drops. But perhaps it does not work for mining. My information on the effect is limited.
Silvertongue: useful. Bonus on next quest or achievement. Takes 7 hours to grow, which is a bit on the longish side for that measly 5% bonus.
Yellow Crumb Flower: grows the slowest at 9 hours, and gives a short "fast learning" buff. Much like the Pungent Sunrise Drink. I understand that speeding up learning too much is not intended, but like all other speedup things like donations, I don't see the appeal of doing that. It's very time consuming to grow a sufficient amount of YCF to notice a significant time reduction.
There also need to be bog houses with more space to grow herbs, the 9 plots are not enough to grow enough of the slower growing ones.
Herbs that give equivalent buffs like the Earthshaker or Flaming Humbaba would be nice, but perhaps for other professions.
Maybe a herb that reduces energy loss by 50% when cooking (including transmogifications)?