@WGregory that is NOT a zoysia seed head.

Edited to add that both the grass and seed heads look like tall fescue.

 

@WGregory that is NOT a zoysia seed head.

Edited to add that both the grass and seed heads look like tall fescue.

If that's the case then I have a pretty serious situation. I planted my back yard with zenith zoysia and this is what came up.

How is that possible?

 

That is nutsedge

 

I agree with @Monocot Master . Looks like Annual Sedge to me.
https://content.ces.ncsu.edu/annual-sedge

 

I agree with @Spammage.

 

So I bought the seed from Lowe's. If it's sedge, the entire contents of every bag must have been sedge seed because my entire yard is now covered in this.

 

I agree with @Monocot Master . Looks like Annual Sedge to me.
https://content.ces.ncsu.edu/annual-sedge

I agree with this. I have not run across Annual Sedge before.

 

It would make most sense if you bought Zoysia seed from Lowe's that it has this annual sedge in it than you actually getting TF that is going to seed. To me, and I'm no expert, the seed heads in your picture don't look like the seed heads shown in the link to annual sedge. ardon:

 

It would make most sense if you bought Zoysia seed from Lowe's that it has this annual sedge in it than you actually getting TF that is going to seed. To me, and I'm no expert, the seed heads in your picture don't look like the seed heads shown in the link to annual sedge. ardon:

That's what I was originally thinking too, but I found some other sites and photos that changed my mind. One of them was a post here by @Powhatan.

https://www.wildflower.org/gallery/result.php?id_image=48449

 

So what do I do now? It's certainly not zoysia. I mean the entire yard, every seed I planted came up like this.

Spray and start over?

 

Here's annual sedge I pulled up in 2019 and 2020.

https://thelawnforum.com/viewtopic.php?p=203607#p203607

 

Here's annual sedge I pulled up in 2019 and 2020.

https://thelawnforum.com/viewtopic.php?p=203607#p203607

Looks like it to me.

 

I do not think your zoysia seed was contaminated with weed seeds. Sedges are very efficient at exploiting a freshly prepped seed bed. All those nutlets and seed sitting dormant in the soil are now happy. Throw in some GA summer heat and even better some rain, and the sedges are going to take off. This applies to many other weeds as well, both grassy and broadleaf.

I have never grown zoysia from seed, but most of the warm season turf grass seed has a long germination and development period. Much longer than most weeds. I would not give up on the work you have done, but I would get your weeds under control. That may be as simple as cutting them back twice a week or more. But if they are bad you should be exploring your spraying options.