Carpet grass is invasive and most people don't like the look of carpet grass. It takes a long time to grow carpet grass in the spring and carpet grass turns brown quickly when the weather gets cold.
Carpet grass is not a flowering plant. Carpet grass is a type of grass that grows in the southern states with little or no maintenance.
grass+sunlight
Use Sunlight and Grass
There is no sunlight for the grass to grow / survive.
on the carpet
cut it
grass+sunlight
Try sunlight
The only source of sunlight is the sun.
That is the grass dying. Plants need sunlight in order to photosynthesize. Covering grass with a board is depriving it of sunlight.
The grass turns green when it is exposed to sunlight.