coriander
荽 centers on the herb coriander, a plant used for its aromatic leaves and seeds.
荽 combines the grass radical 艹 with 妥, which likely contributes a phonetic element. The character is used specifically for coriander.
The grass radical 艹 sits above 妥, like a plant with a settled, rounded shape. Picture a bunch of coriander leaves resting comfortably on a plate.
For イ, imagine an eagle (イーグル) swooping down to grab a sprig of coriander: eagle -> イ, and the bird snatches the herb.
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coriander (Coriandrum sativum); cilantro