Which preposition to use with bourgeoning

into Occurrences 1%

His court-room manner had bourgeoned into his best drawing-room blend of faintly implied gallantry and deep consideration.

of Occurrences 1%

As on a dark April day, with a lowering sky, you have seen the wind suddenly stir high in the heavens, and the sun look through on the dripping green of the young trees and the gay bourgeoning of the flowers, so, looking on my love's face as she took in my words, there awakened a kind of springtime joy.

Which preposition to use with  bourgeoning