This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 藠 is uncertain. It visually contains 艹 (grass) and 皛, but the component relationship is unclear.
The top grass radical 艹 suggests a plant, but the overall meaning is unclear. Picture an unknown leafy plant with a tangled root system.
For キョウ, imagine a plant so rare that people in Kyoto (京都, きょうと) study it: Kyoto -> キョウ, and the grass radical hints at the plant.