Crep grasses are not grouse habitat, grouse are birds of the mountains, woods and edge habitat. Additionally, grouse are cyclic. Wild grape and greenbriar are good grouse foods along wth crabapple and hawthorn. For your information, barberry is probably the worse thing you can have as it is a harbor for deer ticks, the more barberry, the more ticks. You should cantact the PA Game Commission for information about grouse habitat. The PA grouse study area used to be in Centre CO near Scotia.