pullulate

be teeming, be abuzz; "The garden was swarming with bees"; "The plaza is teeming with undercover policemen"; "her mind pullulated with worries"

move in large numbers; "people were pouring out of the theater"; "beggars pullulated in the plaza"

produce buds, branches, or germinate; "the potatoes sprouted"

become abundant; increase rapidly

breed freely and abundantly