This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 莕 is uncertain. It visually combines the grass radical 艹 with 杏, but the original semantic or phonetic role of 杏 in this character is unclear.
The grass radical 艹 over 杏 (apricot) suggests a plant, but the specific meaning is unclear. Picture an unknown herb growing under an apricot tree.
For コウ, imagine an apricot (杏, きょう) tree with a mysterious herb underneath, and the sound コウ echoes the apricot's on-reading キョウ as a close reminder.