I recently installed new grass in the front and back of my customers house. The front had rye/blue and the back had dwarf fescue. Nut sedge came up in the front ( in the middle of the sod roll not the seams) but not in the back. I called the grower (Pacific sod) and they said it was my compost that i mixed into the soil. I told them that I used the same compost in the back yard. In your opinion where did the nut sedge come from?