I have 6 large pine trees 3 on each side of my yard that creates a conopy providing plenty of shade in the summer.The area under the trees is bear and grass will not grow. I have tried mixing top soil and peat together and then seeding with shade seed, this mixture works for a few weeks and then the grass begins to die. I have also tried to lay sod and have had no luck with that as well. I have considered creating a bed of mulch to prevent the soil from turning to mud when it rains, but in the fall the needles would be impossible to remove. Does anyone have any suggestions?