Native bentgrass seeds can lay dormant in the soil. They can germinate when soil is disturbed, such as when you prepare the ground for seed. They thrive in moist soil and wetter areas of the lawn. It can be killed with glycophosphate (Round Up) and reseeded. It can be inhibited by the following: rake the area vigorously and bag the grass raked up. Reseed the area with Black Beauty Ultra and maintain the lawn once established at a 3-4 inch mowing height. Repeat each spring and fall until it is resolved. The bentgrass does not like to be shaded and the Black Beauty Ultra will eventually take it over. In the meantime, it will hide the lighter green bentgrass.