Some things I tried:
Farming mandies in buburimu
Farming tier 3-10 cardians in horutoto
Farming mobs in toraimarai
Farming Stcemqestcint and surrounding treants in dyna-valk
(in case this one seems weird, the flavor text on the petal says "a redolent flower petal", and Stcemqestcint drops a
redolent root, plus dyna-valk is a DREAMlands dyna zone - it was a stretch, I admit)
No luck.