This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
薥 is a rare character. It combines the plant radical 艹 with 蜀, which likely contributes sound. The exact historical development is uncertain.
The grass top 艹 and the lower component 蜀 suggest a plant name, possibly a type of azalea (れんげつつじ). Imagine a rare flower with a complex, layered bloom.
For ショク, picture a shock of bright azalea flowers blooming: shock -> ショク, and the plant's vivid color is a shock to the eyes.