So I needed a ton of black lotus to transmute into black pearls, and some popular places in Mooshu for harvesting weren't working too well. Because both black pearls and black lotus are really expensive in the bazaar, (and just hard to come by) I decided I would have to grin and bear it. But then as I was questing in Wintertusk, I found a pretty decent place almost guaranteed to have black lotus! :D
Once you enter Vestrilund, keep going straight until you come to a bunch of caves and WinterBranches roaming around. To the left there's a hut with a bear named Magini out front. If you to the side there will be a basket, and around the basket three black lotus.
So, if you keep flipping through the realms, thats 3 lotus in a minute. That would be 90 lotus in 30 minutes :D (If someone already posted this trick I apologize)