I planted pink mully grass back in June. It looked so green and healthy. I planted according to directions. It is turning brown at the base of the plant and I am afraid it may die. what do I need to do? we have had a lot of rain this summer, but it is in a well drained area of the yard. I have given it plant food. what else should I do? How do I do that would help fix it to make it grow. I am afraid it might not survive.