There is a large white pine tree in my yard that i just can't get grass to grow under. I have tried many times but it just isnt happening. The foliage is just too thick and also the acidity of the needles. What i would like to do is put a ground cover down that would be relatively easy to rake the needles out of when necessary. I know that this and the shade situation is the hard part. Are there any ground covers that would work good in this situation???