Best way to treat crabcrass in a organic way

Discussion in 'Organic Lawn Care' started by JFGauvreau, Apr 9, 2011.

  1. JFGauvreau

    JFGauvreau LawnSite Bronze Member
    Posts: 1,297

    What if you can't use pre-emer, or chemicals to kill the crabgrass?

    I know that crabgrass is a annual weed and will most likely be killed as the first frost comes in fall. (in Canada), but the seeds will remain on the ground, therefor creating new plants in spring.

    Is crabgrass a type of weed that does not tolerate frequent mowing? If so, frequent mowing would eventually kill the crabgrass?

    What are the other ways you can "Naturally" kill the crabrass? I am speaking of mostly Kentucky blue grass lawns, kentucky is good for choking out weeds at a 3" height, but crabgrass grows higher and sooner than that.

    Any help would be appreciated.
     
    Last edited: Apr 9, 2011
  2. Leo the Landscaper

    Leo the Landscaper LawnSite Member
    Posts: 116

    Corn Gluten Meal is the organic answer to preemergent herbicides.
     
  3. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,315

    Better soil structure. Dont have an envirement where CG can thrive.
     
  4. JFGauvreau

    JFGauvreau LawnSite Bronze Member
    Posts: 1,297

    Doesn't corn gluten meal attracts a lot of ants?

    What kind of soil crabgrass doesn't thrive in? We have mostly clay here.
     
  5. Leo the Landscaper

    Leo the Landscaper LawnSite Member
    Posts: 116

    There isn't one! I think he means develop a strong thick turf by way of developing a healthy soil which will compete better against the crabgrass.
    Posted via Mobile Device
     
  6. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,080

    I never use CG pre-M on turf...

    CG, is a low growing grass that fills in vacant, hot, dry spots in the dirt, that are not being used by other grasses... They can live off dew in such a way that it thrives, during the same time KBG is slowing down, even going dormant in the summer heat...

    Mulch mowing, keeps the soil cool and protected for KBG roots and Rhyzomes to grow into... Mowing higher when the heat comes does the same thing... Not fertilizing just b4 or during the heat is an important practice...

    This business about CGM for pre-m, and a 2yr buildup to prevent 80% of seed germination... begs a simple question, When can one overseed???
     
  7. ICT Bill

    ICT Bill LawnSite Platinum Member
    Posts: 4,115

    for KBG 3 weeks before or 3 weeks after seeding
     
  8. JFGauvreau

    JFGauvreau LawnSite Bronze Member
    Posts: 1,297

    Ok thanks for your help guys
     
  9. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,315

    Correct, crabgrass does thrive worse in a sandy soil. A healthy turf in loam will fight it off better.
     
  10. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,080

    Could I also sow CG 3 weeks b4 and 3 weeks after?

    (A root inhibitor pre-m lasts for 90 days, and kills every seed that germinates)...

    What is the system that makes CGM special?
     

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