This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
穙 combines 禾 (grain) with 菐, which likely contributes a phonetic element. The exact historical development is uncertain, and the character is rare.
With 禾 (grain) on the left and a complex right side, 穙 might suggest something related to grain or plants, but its meaning is unclear. Picture a rare, mysterious grain plant with an elaborate shape.
For ホク, imagine a hawk (ホーク) circling over a field of grain: hawk -> ホク, and the bird watches the mysterious 穙 plant.