lawn replacement question
My house has the original lawn put in in 1968, probably blue grass as it sucks up the water. I'm in process of converting lots of it to flower beds and groundcovers. If I want to replace the rest with buffalo grass, do I have to remove it first, or can I just keep sprinkling the new grass seed and watering less and less? Or what's the easiest way to replace a bluegrass lawn with a more drought tolerant lawn? Thanks.