Find a way to the Vesspyr Isles. You can take any Druid ring (one is in the lower part of the travel map, south of Cardin Ward at -436.27, 27.49, 444.56 ).
Talk to Roy at Falinpol. The entrance is at 102, 188, -127 . We were able to fly there unmolested.
Take the teleporter in the middle of the room to the lower level and talk to Claudia.
Find plants for Claudia on all the the main isles. These are all a Vesspyr Willow or Vesspyr Shrub and are trackable with the "Track Harvestable" Prestige skill. There are multiple spawn points on each isle, but they are always on the outer edge of the isle. Here's where we found them during beta, do please add additional locations.
HINT When flying between the isles, the green glowies are a speed boost, like at the Aether Races.
Claudia will take the plants from you, but you can go back and collect more any time you want. We've noted the islands the different plants are on below.