せいたかよもぎでしょう
背高蓬でしょう
seitaka yomogideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of せいたかよもぎ

1. Probably tall.; Probably a tall pampas grass.

Polite
Presumptive
Conjecture
Usually Written in Kana