Help on new sod: Two questions
I moved from Iowa to OK 4 years ago and recently my bride and I built a new home. Sod was laid with Bermuda, which obviously we didn't have in Iowa. The sod was laid in October and I have watered it all winter. I put down a winter fertilizer, but my sod is now full of a purple flowered weed and clumps of green grass. Also, there are lots of spots where there appear to be sink-holes in the lawn.
Question 1: Will it hurt the sod to spray the weeds with a weed killer?
Question2: How do I fix these OK sink-holes and get the sod more level?
Thank you for helping this new Oklahoman learn to grow in Red Clay.