This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 葏 is uncertain. It visually combines the grass radical 艹 with 津, but the original semantic and phonetic roles are unclear.
The grass radical 艹 sits above 津, suggesting a plant growing near a harbor or ferry. Without a clear meaning, imagine a mysterious water plant.
For セン, picture a centipede crawling through the grass (艹) near the water (津): cent -> セン.