pullulate

1. be teeming, be abuzz;

"The garden was swarming with bees"

"The plaza is teeming with undercover policemen"

"her mind pullulated with worries"

2. move in large numbers;

"people were pouring out of the theater"

"beggars pullulated in the plaza"

3. produce buds, branches, or germinate;

"the potatoes sprouted"

4. become abundant; increase rapidly

5. breed freely and abundantly