Answer: It is difficult to get grass to grow in the shade. It may look good for a year or two, but it will struggle and thin out. If you want to grow grass in a shady area you'll need to resolve yourself to reseeding every spring to help keep it thick. To further help the cause, water deeply only once a week and try to mow high so you leave lots of blade height. The longer blades will help manufacture carbohydrates for the roots which should strengthen the roots. I'm not sure why you are seeing soil creeping up on the grass blades. I think it's probably more evident because the turf is thin. I'd reseed next spring to help thicken up the lawn.
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