Is this grass dead? Put down cardboard and 7 in of mulch, 10 months ago. Ready to seed area but worried grass will grow back. Portland, OR. https://www.allforgardening.com/788725/is-this-grass-dead-put-down-cardboard-and-7-in-of-mulch-10-months-ago-ready-to-seed-area-but-worried-grass-will-grow-back-portland-or/