First question: do these weeds have a triangular stem? Looks similar to yellow nutgrass (Cyperus). If so, do not pull unless you are willing to keep pulling until it is gone. There are products specific to nutgrass. If you pull it, it will multiply.

hortster

Thanks for your response. I am going to look again in the morning and post again. I will take a better picture as well.

After reading what nutgrass is, it fits the description - at least the part of it rapidly growing, not looking niceand growing in summers with above average rainfall.

If it is nutgrass/nutsedge, does that mean I got bad seeds from Lesco or it just happened to grow around the same time of me over seeding by coiencendence?

Thanks

thanks for identifying my yellow nutsedge problem as well!

"Nutsedges are common weeds in landscapes and gardens in the coastal valleys, Central Valley, and southern areas of California. They thrive in waterlogged soil, and their presence often indicates drainage is poor, irrigation is too frequent, or sprinklers are leaky. Once established, however, they will tolerate normal irrigation conditions or drought."
Although many disagree with that it is what I have seen over the years as well.

Here is a link that might be useful: About Sedges

I took one of the weeds to my lesco dealer and it is indeed nutsedge. I bought sledgehammer which should work. If not, they recommended using dismiss early next spring.

I still don't get why they just appeared. That may be a good thing since I was paying attention and treated it within a week of spotting the annoying weed.

Thanks for the replies.

Most grass seed has some weed seed in it. Take a look at the ingredient list. It might havee a percentage of "other seed" listed.

True, but this weed sounds like a noxious weed which my seed and most good seed has none of,

DEX, your yard is not a vacuum. Seeds from nutsedge can come in on the wind, blowing rain, birds' feet, etc. If you are using a lawn service....trust me, they do not clean their equipment from customer to customer.

The nutgrasses do well in in my non-irrigated, well-drained, dry soil.

By the way, the name of the herbicide is "Sedge Hammer" not Sledge Hammer....cute? It does work.