upsprout

From up- +‎ sprout.

upsprout (third-person singular simple present upsprouts, present participle upsprouting, simple past and past participle upsprouted)

1. (intransitive, poetic) To sprout up.
   • 1883, George Henry Calvert, Sibyl, page 32:

     To-day he felt upsprout / Purest desires, and he hearkened / To those profoundest, wisest whispers / That in the sane will not be hushed;