Plant ID forum: Grass/Weed Identifier

Views: 237, Replies: 8 » Jump to the end
Charleston, SC
solo1001
Aug 7, 2017 1:55 PM CST
Let me preface this by apologizing as I'm sure these types of post are legion and are annoying. My thumb is not green enough to ID these via other photo sites and the garden center I visited was not able to help. I live in Mount Pleasant, SC and I have what I believe is centipede (1st image). I put a pre-emergent out in March (followed by a follow up in June) which seemed to help for a bit and then a different color grass started springing up (image 2). I didn't mind so much even though it was strange. But then, some sort of weed began infesting my yard (image 3). The pic is from a concentrated area but it pops up all over the lawn. It comes out in clumps like other weeds.

Can anyone help a) ID these and b) tell me if there is a way to get rid of them? I know it's too late for the summer which is fine but it really takes some fun out of the back yard. My front yard is fine minus a few bouts of red thread which I'd take all day over weeds. I can get rid of the clover and dandilions but these grassy weeds give me fits. Thank you and again sorry for the repetitive question.

Thumb of 2017-08-07/solo1001/29a15e


Thumb of 2017-08-07/solo1001/3abf63


Thumb of 2017-08-07/solo1001/c14dd6

Name: Paul
Utah (Zone 5b)
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Paul2032
Aug 7, 2017 2:05 PM CST
Solo..... Welcome! ....absolutely no reason to apologize. Your inquiry is perfectly appropriate. Your pictures look like a coarse weedy grass has crowded out the more desirable grass. It is probably perennial and a pre-emergent will have no effect. The only way to get rid of it is a general grass killer and then reestablishing lawn grass......
Paul Smith Pleasant Grove, Utah
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Aug 7, 2017 2:15 PM CST
Welcome!

It's difficult to identify grasses especially without seeing them in close-up detail. I'm not familiar with what are called "warm-season" turfgrasses so maybe someone else will recognize them. I wonder though if your third picture is crabgrass since it looks rather prostrate. Unless someone else can help what you could do is send your pictures or take specimens of the plants to your nearest Extension office. They will be very familiar with the turfgrasses and grassy weeds in your area. Here's a list of offices in SC.

http://www.clemson.edu/extensi...
Charleston, SC
solo1001
Aug 7, 2017 2:32 PM CST
Thank you both for your replies. I'll visit the Extension office. I thought the third picture might be crabgrass. It was much easier to ID when it was EVERYWHERE which means maybe I'm doing something right since it's sporadic now.
Name: Paul
Utah (Zone 5b)
Grandchildren are my greatest joy.
Charter ATP Member Annuals Echinacea Vegetable Grower Hybridizer Tomato Heads
Garden Photography Birds Cut Flowers Foliage Fan Houseplants Plant Lover: Loves 'em all!
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Paul2032
Aug 7, 2017 2:55 PM CST
I often see crab grass in lawns that are mowed to short and around the edges of lawns trimmed with string trimmers.
Paul Smith Pleasant Grove, Utah
Charleston, SC
solo1001
Aug 7, 2017 3:04 PM CST
Paul it's funny you say that -- I kept it VERY short at the beginning of the summer just so I wouldn't have to mow as often and that's when I started seeing it. I've since raised the wheels just for aesthetic value but there very well could be something to that. Also, the picture that looks like crabgrass is in a corner that is ONLY trimmed with a string trimmer. Who knew?
Name: Scott
Tampa FL (Westchase)
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ScotTi
Aug 7, 2017 4:23 PM CST
#2 looks to be Doveweed, a problem for me also in my St Augustine grass. A treatment with Atrazine is recommended right before or soon after it emerges in late spring.
If it is Doveweed it should be coming into flower soon to grow the seeds for next years annual emergent.

Thumb of 2017-08-07/ScotTi/ce1aad

The tiny blue flower can be seen in daylight hours.

Thumb of 2017-08-07/ScotTi/0f755b
(enlarged photo)

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 7, 2017 4:27 PM CST
solo1001 said:Paul it's funny you say that -- I kept it VERY short at the beginning of the summer just so I wouldn't have to mow as often and that's when I started seeing it. I've since raised the wheels just for aesthetic value but there very well could be something to that. Also, the picture that looks like crabgrass is in a corner that is ONLY trimmed with a string trimmer. Who knew?


Mowing too short makes the turf thin and allows more weeds to invade, so although it's tempting to do, it ends up being counterproductive.
Charleston, SC
solo1001
Aug 7, 2017 4:34 PM CST
ScotTi said:#2 looks to be Doveweed, a problem for me also in my St Augustine grass. A treatment with Atrazine is recommended right before or soon after it emerges in late spring.
If it is Doveweed it should be coming into flower soon to grow the seeds for next years annual emergent.

Thumb of 2017-08-07/ScotTi/ce1aad

The tiny blue flower can be seen in daylight hours.

Thumb of 2017-08-07/ScotTi/0f755b
(enlarged photo)



Great -- so I'll just have to catch it with atrazine early spring next year? Will Atrazine work as a pre-emergent for crabgrass as well? Looks like it will get the annual bluegrass which is the bane of my existence in the spring.

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