ginseng
葠 refers specifically to ginseng, the plant or its root.
葠 combines the grass radical 艹 with 侵, which likely provides the sound. The character is used for ginseng, but the exact historical development is uncertain.
The grass radical 艹 sits above 侵, like a plant that invades the ground with its valuable root. Think of ginseng as the prized root hidden under the grass.
For シン, imagine a ginseng root shaped like a shin bone: shin -> シン, and the root is dug up from under the grass.