Actually in thinking of the greenhouse idea, it would make sense as well as give the feature an instance for each player (ala Moghouse FFXI) also maybe they could incorporate the feature as an unlockable. e.g. allow Botanists to own their own green house after completing a quest only available after R20. (kinda like chocobo license in FFXI, i think if it were set to be able to do at botanist R20 it'd be a close enough goal to go for yet still high enough that it is an accomplishment.)