This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
薷 combines the grass radical 艹 with the phonetic component 需. The exact historical development is uncertain.
The grass radical 艹 on top of 需 suggests a plant, but the specific meaning is unclear. Picture a rare, unidentified herb growing in a damp place.
For ジュ, imagine a rare plant that you need to water with a jew's ear mushroom (きくらげ) juice: jew -> ジュ, and the plant needs moisture.