Return to the Lawn Care Forum | Post a Follow-Up

 o
Need help identifying grass/weed

Posted by carillon East TN - Zone 7a (My Page) on
Sun, Apr 20, 14 at 11:44

My back yard is too shady for zoysia which is what I have in my front lawn. At any rate, I see patches of differently colored (light) green in my back yard. I'm hoping someone here can help me identify what this is and how to combat it. Thanks!

 photo photo_4_zps9a41878f.jpg

 photo photo_1_zpscd8c4751.jpg

 photo photo_3_zps991fcefb.jpg

 photo photo_2_zps0a2a6fe5.jpg


Follow-Up Postings:

 o
RE: Need help identifying grass/weed

Most likely Poa Trivialis - it does well in shady, often wetter areas. It is ridiculously hard to get rid of without harming other grasses, and the few herbicides that work are quite expensive.

Look for shallow rooting and lots of whitish root-like things above the ground (stolons). It spreads mostly by those, and they are easily spread around the yard by dethatching and core aeration.


 o
RE: Need help identifying grass/weed

I have experience with poa annua. I am going to assume they behave the same way. The only think that makes me unsure it is pia is the lack of seed heads. If and when you see those, you'll know what I'm talking about and it is definitely poa.

Poa will die off in the heat of the summer because of its shallow roots. Since it is in a shady area, I don't know if that will happen in your yard. I have heard to bag your clippings as that helps the seeds from spreading. I cannot speak to the effectiveness of this. The only thing I can tell you works for sure is a good pre-emergent. I used a leaving product faithfully since last fall and the only poa in my Bermuda lawn is where the grass is thin. Definitely a night and day difference from last year. Sorry as this may not give you much help for what to do to get rid of it this year now that you have it.


 o
RE: Need help identifying grass/weed

Poa Annua and Poa Trivialis are very different from one another, and share few traits other than they are both weedy grasses in lawns.

Poa Annua may "cluster", but the size of the patches ( 1 ft to 3 ft irregular roundish patches) is much more indicative of Poa Trivialis. I'd rather have 5 Poa Annua invasions than 1 Poa Trivialis invasion.


 o
RE: Need help identifying grass/weed

Thanks for the replies so far, this grass/weed has not shown any seed heads and as you can tell in the picture it has grown to a rather large size along the edge of a bed where I got the sample.

So without the seed head, does that point to Poa Trivialis?


 o
RE: Need help identifying grass/weed

Yes. Poa Annua is seeding now, and Poa Trivialis later (and often not at all at lawn heights). So how does it spread if not by seeds? By those stolons forming new plants where they touch the soil. That's why the patches spread outward from the center.


 o
RE: Need help identifying grass/weed

Anyone have any successful ways of getting rid of this? I'm hopeful it will die once the temps get up but what about preventing it next spring? Thanks


 o
RE: Need help identifying grass/weed

Will Celsius kill it?


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Lawn Care Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here