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Thread: Need Lawn Help

  1. #1
    Join Date
    Nov 2007
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    Default Need Lawn Help

    I attempted to put in a new lawn in late May/early June. I got a good amount of germination from the new grass seed, but I also got a ton of crab grass. I want to be able to reseed in September but I do not know what my next step should be. Should I leave the crab grass alone and hope the new grass doesnt get choked out or should I attemp to treat the entire area with a chemical and hope only the crabgrass dies.

    Any suggestions would be great.

  2. #2
    Join Date
    Dec 2007
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    Tennessee
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    Default Re: Need Lawn Help

    Just try a crab grass preventer in the spring.

  3. #3
    Join Date
    Dec 2010
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    Houston Texas
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    Default Re: Need Lawn Help

    Optimally you can spray for the crabgrass only then inject new seed directly into the soil.

    OR

    You can overseed with grass seed in the fall and wait until the cold weather kills the crabgrass The use a crab grass pre-emergent in the spring

  4. #4
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    Portland, Oregon, formerly of Chicago
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    Default Re: Need Lawn Help

    Houston,

    Doesn't pre-emergent crabgrass killer also prevent the germination of all seeds, much like Preen?

  5. #5
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    Default Re: Need Lawn Help

    yes, depending on the type used. Some work on only monocots, some work on only dicots.

  6. #6
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    Default Re: Need Lawn Help

    Quote Originally Posted by ordjen View Post
    Houston,

    Doesn't pre-emergent crabgrass killer also prevent the germination of all seeds, much like Preen?
    That's why it works so well. The OP could not have used a pre-emergent when he planted his lawn last spring because then the lawn wouldn't have germinated. Most lawn grasses are perennial so they won't have any problems coming back in the spring with a pre-emergent, but the crab grass, it's an annual so the pre-emergent will stop it.

  7. #7
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    Portland, Oregon, formerly of Chicago
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    Default Re: Need Lawn Help

    So, I should over seed in the fall early enough so that it germinates before spring?

  8. #8
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    Houston Texas
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    Default Re: Need Lawn Help

    Correct. Bluegrasses take about 3 weeks to germinate and get established. Rye grasses are much faster.

  9. #9
    Join Date
    Apr 2012
    Location
    Northern Virginia
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    140

    Default Re: Need Lawn Help

    Quote Originally Posted by ordjen View Post
    So, I should over seed in the fall early enough so that it germinates before spring?
    Piggyback on the question:

    (1) No. Virginia -- I think the soil is very high PH and we have NO sprinklers.
    We have about 15,000 sqft of grass growing surface (I don't say "lawn" because our property is on a downward slope. In the front, we have several mini-lawns with probably different issues.

    (a) One mini-lawn is a pie-shaped space fully shaded by an old Cherry Tree in the center. I'm told the shade & Cherry tree sucks up too much energy leaving the grass very blotchy & grasping for life. I want to try to revive it by overseeding and better watering.

    (b) Another mini-lawn was sodded 2 yeras ago, but there are "bare areas"; no roots, no brown grass, just nothing. I want to try sodding the bare areas after laying lime to reduce the PH.

    (c) Generally, we didn't care the grass at all besides spraying by TruGreen at the front (when we had just 2,500 sqft in Calif, I did the Scotts crab/weed & feed granules & had very good results). In No VA, it is like Cambodia with some species of weeds growing 3 feet tall in a month.
    The result is varous grass areas have crab/weed & blotchy from the eratic water supply (rain only, no sprinklers).
    Should I do a massive overseeding in early fall, and a pre-emergent next spring ?

    PS - how fresh are seed bags from last year ?? They're the Scott's bags from HD.

    (d) We also have planting areas mixed with mini-lawns both in the front & back. The planting areas are full of several weeds & invasive species that grow vertically (3 feet) and horizonally (like vines & maybe ivy). I am slowly pulling them out, one mini-area at a time, but they are fully established.
    Would using Preen help to keep new growth in control ??
    I suppose some old roots have survived and will grow out again . . . I don't want to use Roundup for fear of contaminating the good plants. Any ideas to last the summer, and also to keep things in control until next spring ??

    We DIDN'T mulch this year because of expense (layers of mulch were piling up and we didn't want to throw $3,000 at the weed probem year after year). The downward slope, amount of area and our old ages have deterred us from tackling the problem head on (also No Virginia weather is not as bad as Texas, but it's winter, then a cold spring and summer weather beginning June 1 keeping us indoors & free from heart attacks).

  10. #10
    Join Date
    Aug 2007
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    Maryland
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    Default Re: Need Lawn Help

    I would treat the weeds as much as possible before the fall. Check label on when to stop for reseeding. crabgrass killers don't work too well from my experience. better to put a pre-emergent with Dimension in it in the spring.
    Rake or thatch out the crabgrass out as much as possible, then reseed. Covering the seed or using a slit seeder will get better results with germination. In northen MD where I am, I have reseeded as late as end of september/early october with okay results. It depends on the weather. Mid september would be better. VA is a few weeks at least behind in cold weather.
    Fetilize when planting. Hope for some fall rain. At least the temps are down.
    Use preemmergent in the spring to keep the crabgrass at bay.

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