hazelnut, filbert
榛 centers on the hazelnut tree and its nut, the filbert. Both meanings refer to the same plant and its edible seed.
榛 combines the tree radical 木 with 秦, which likely contributes the sound. The character specifically denotes the hazelnut tree.
A tree 木 with a distinctive right side 秦: picture a hazelnut tree laden with clusters of filberts.
For シン, imagine a thin shell cracking open to reveal the hazelnut: thin -> シン, and the tree 木 on the left reminds you it's a nut tree.
Asian hazel (Corylus heterophylla var. thunbergii); Siberian hazel
Japanese alder (Alnus japonica)
Japanese alder (Alnus japonica)
Japanese cherry birch (Betula grossa)
Haruna Special Needs School (older name style)
luxuriant vegetation
Eurasian hazel (Corylus avellana)
Japanese hazel (Corylus sieboldiana)