Ging2 dig deep and thoroughly remove stones. Last spring I dug out the area required for carrots, for a friend who,simply could not grow them. I dug out a trench some 9" deep and Infilled with multipurpose compost. I then back filled with the soil and with a 3 pronged aerator mixed the soil and compost together. We grew splendid carrots. I always fleece carrots as soon as sown until picking to prevent carrot fly.