damaged grain
秡 centers on grain that has been spoiled or damaged, rendering it unfit for normal use.
秡 combines 禾 (grain) with 犮, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is associated with damaged grain.
The grain radical 禾 is paired with 犮, which looks like a twisted or broken stalk. Imagine a field of grain where the stalks are bent and spoiled.
For ハツ, picture a farmer discovering damaged grain and exclaiming 'Hats!' in frustration: Hats -> ハツ, as the ruined harvest is revealed.