You must be somewhere close to Sioux Falls.
I live in NW Iowa, LeMars.
I put in a new lawn this past spring. Came up great, at first.
Then, by early summer, the weeds started taking over. Crab grass,
water grass and others. Was pulling my hair out trying to figure
out how to get rid of it.
Talked with some landscaping and lawn care people. Found a
product called Q4. Did some research on it. Decided to give
it a try. Said it would kill the broadleaf grasses, but leave the Bluegrass.
Sprayed the entire lawn. Within a week, the entire lawn was brown.
Im' thinking, this isn't good. About 2 weeks later, the bluegrass started
coming through all of the brown, dead broadleaf grasses. By fall, my lawn
was mostly green with bluegrass again.
Being it is a new lawn, it is still somewhat thin. So hopfully, after the
winter snow is gone, that next spring the grass will be greener with
less weeds, and start filling in.
Greg