Need some new help here with our recently planted sod lawn. We had new sod installed last August - a blend of fescue and KBG. One section in our front yard is doing really well to this point, but the second lawn in our back yard is struggling.

We are in Santa Cruz, CA - in a fairly warm micro-climate at about 300ft elevation.

So far our back lawn has been quite the battle after getting the new sod installed - first it was the moles, then gophers, then army worms a month later, then during the fall some fungus, and now an oxalis invasion.

I have weeded 3 huge loads of oxalis in our other non-lawn garden areas all around our house in the past week - and with somewhere between 40-60 inches of rain so far this wet season, we have had very wet ground since October...

This lawn is on a flat surface - but there is a french drain at the downhill concrete edges that should clear the water. There has been no standing water or puddling on the lawn despite all of our rain.

I didn't mow the lawn between late November until the first weekend in February - there was very little growth despite that - and with the rain we have been having here there was rarely any time between storms to ever get out and mow it. I finally mowed it 2 weekends ago and found some lifted corners from moles, a few tunnels around the concrete borders and other damage - as well as remnants of the army worm damage. Now I have the oxalis going to town.

I mowed it again last night - a bit shorter this time, and then sprayed the oxalis with "Bayer Advanced Natria Lawn Weed Control"

Here are a couple of pictures of the lawn showing the current condition:

Also, I have soil reports and the history of the new lawn/yard in an older topic here

I prefer to stay as natural as possible for this lawn - and wonder what my options are right now...I have some milorganite and wonder if the extra iron in that might help me control the oxalis a bit further?

Looking back at the older thread - I am so glad I didn't attempt to grow buffalo grass in this area - the shade from the fence on the side of this lawn really changes even how the fescue grows...