I have read and heard that you cannot mix TTTF into existing blue/rye lawns. I was wondering how bad it really looks? I understand the colors are quite different, but wouldn't it be spread out and not just patches here and there? What if you overseeded once/twice a year with it? Wouldn't it start to take over the lawn? What about an old school lawn here in ohio which is a tall fescue/blue/rye mix? If a lawn has a lot of K-31 tall fescue in it already wouldn't the TTTF camoflauge the K-31 better than overseeding with a rye/blue mix? I realize the best option would be to kill the lawn and start over if you have clumps of K-31 sparingly spread out, but some customers aren't willing to pay the money for that.