Which preposition to use with overgrowth

of Occurrences 6%

The towns of Lancashire have undergone so much change during the last fifty years that their old features are mostly either swept away entirely, or are drowned in a great overgrowth of modern buildings.

from Occurrences 1%

All was obstructed by a thick overgrowth from where the path ceased, and the ground covered with a dense bed of damp wood-earth.

Which preposition to use with  overgrowth