This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 茽 is uncertain. It visually combines the grass radical 艹 with 仲, but the original semantic and phonetic roles are unclear.
The grass radical 艹 sits above 仲, which suggests a person among plants. Without a clear meaning, picture a person standing in tall grass, blending in.
For チュウ, imagine a person named Chu standing in the grass: Chu -> チュウ, and the person is the 仲 part under the 艹.