I don't have an answer but have a similar problem. Spots of fluffy lighter colored grass in my dark green bluegrass. Do your spots of the different grass pull out real easy? The stuff I have invading my lawn has almost no root. I can grab a handfull and it pulls out right to the dirt.

Waldvo: That is either Nimblewill or Bentgrass most times. Both are considered weeds in most lawns. Many varieties of bentgrass are used for both home lawns and golf course Fairways, tees and greens. It also often shows up as an invasive weed (especially in low or wet spots). Nimblewill is just a plain old school weedgrass (no redeeming value what-so-ever).

There is another thread or two going on Nimblewill vs. bentgrass and you can use the site's search option to explore those threads.

Michael: The first photo looks enough like zoysia for it to be possible, but the ID characteristics require up close and personal details you cannot see in a wide shot of the lawn. So...

2 choices: Compare it to the neighbors 'known' Zoysia. And/Or look for very tough wiry stolons (runners) in the patches of (zoysia?)undesired grass. Both grasses have stolons. Stolons allow the grass to spread by creeeping along the soil and sending roots down and shoots up simultaneously. Zoysia has wiry tough stolons. Bentgrass is almost entirely succulent and has no woody tissues at all. Either you'll find tough wiry runners (pull some out with difficulty) and diagnose Zoysia or you'll notice no wiry stolons and your bentgrass will pull up easily.

Solution is similar. Round-up the undesired grass when actively growing (treat at least 3 feet past where you think the 'weed' has stopped) and then reseed. Ugh! I know, not fun. But both can be killed and removed in Late summer and the reseeding can take place almost immediately afterwards. I might spray (Zoysia especially) two times. Once Now (or very soon) and once right before seeding in 3-5 weeks(anything that looks even a little suspicious). Round-up (Glyphosphate) breaks down very quickly and will not adversely affect seed. But miss just a bit of the stuff and you'll be doing the renovation again (eventually).

Another solution would be to live with it. Lots of folks do just that.

The last photo looks like silver dollar? I grow it in and around my pond

Thanks for the responses.....

Well, I am still not 100% sure if the "invading" grass is Zoysia.....
but I am gonna do the second option that hortsense suggested: live with it

Too many other things to do than to kill all the patches and reseed....plus the patches seem to grow considerably slower than the rest of the lawn.
So I hope that if it takes over the entire lawn that will mean less mowing!

thanks.
mm

Zoysia in CT? Looks like it, but I would have thought winters would kill it off completely. It looks good, IMHO, except for the mottled appearance it gives your lawn.

THe bottom pic looks like henbit, but I've never heard of that that far north, either.

brizzy --

The patches do turn brown in the winter.....but they always come back green in spring.

I agree, too, that the Zoysia looks nice. It is soft on the feet, slow-growng too.
Since it seems inevitable, I wish it would just take over the whole lawn now.....to get rid of the patch appearance.

mm

If you really want the zoysia to take over, I think you can spray a non selective herbicide (like glyphosate) on the lawn while the zoysia is COMPLETELY dormant (not even a hint of green). Just make sure it's really what you want to do, because I would think zoysia would have a short growing season in CT.

Looks like what I have in my lawn...POA TRIVIALIS

Al