Hi,

My home is located in Chicago and I am planning to over seed the lawn this fall.

I would like some advice on what type of seed mixture I shall use based on the information below.

1. I believe that current my lawn has a mixture of blue grass, rye, and fescue.

2. The lawn has 3 main areas. The front yard is south east exposure with almost no tree shades. The side yard is west facing with 4 middle sized trees. The back yard is north west facing with no trees in the center areas(only has trees on the boundary.

3. In the summer, I only plan to water once a week if necessary. I do not plan to water heavily in summer to keep perfect green lawn.

4. I will do weekly mow and fertilize 3 to 4 times a year.

Based on the information above, shall I choose 80/20 blue grass/rye mixture or 40/30/30 blue/rye/fescue mixture?

Also, a side question, the lawn has some tall fescue invaded in the several spot in the front yard. It does not blend well with current mixture. If I just dig out the affected area and replace with sod, will that keep them out? Do I need to apply roundup to kill them then replace with sod?