I have a customer that wants our company to sow bermuda in his back yard because his neighbors' yards with bermuda are growing into his yard with fescue. I have never sowed bermuda and I don't know if you seed or sprig. This yard is about 2,000 sq.ft. and a slight slope back to a ditch. Is there a way that I could possibly stop the neighbors' grass from coming into his? If so would it be worth it? If you need any more details let me know. Thanks.