This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
柗 is a rare character composed of 木 (tree) and 㕣. The exact historical development and original meaning are uncertain.
The kanji visually combines a tree 木 with the component 㕣, but its meaning is unclear. Picture a rare, unidentified tree with an unusual shape.
For ショウ, imagine a rare tree that only grows in a show garden: show -> ショウ, and the tree is so rare that its meaning is uncertain.