Does Round-Up weaken with age?

Discussion in 'Pesticide & Herbicide Application' started by gl1200a, Jun 4, 2004.

  1. gl1200a

    gl1200a LawnSite Senior Member
    Posts: 518

    A very simple question that has probably been asked many times, but... Does Round-up weaken with age when it is say... 2 - 4 years old.

    Thank you all.
  2. Garden Panzer

    Garden Panzer Banned
    from Seattle
    Posts: 313

    I've had to agitate RAZOR after sitting in the shed all winter, still worked- just separated.
  3. moneyman

    moneyman LawnSite Member
    Posts: 136

    roundup has a 7 years shelf life
  4. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Posts: 2,697

    As long as it hasn't been frozen, it will be ok.
  5. Once mixed, what is the life?
  6. GroundKprs

    GroundKprs LawnSite Bronze Member
    Posts: 1,969

    Would people please quote their references, or are we just trying to wing it? For 20 years in use of glyphosate, I have always been advised not to store it for more than 2 years (opened or unopened).

    A Google for "shelf life" +glyphosate seems to confirm that rule. References:

    Tim, I would venture the life after mixing will depend on water pH, but have never seen or heard any definite numbers.
  7. heritage

    heritage LawnSite Bronze Member
    Posts: 1,268

    I have a spray half life chart from the wilbur-ellis company and roundup is stable at water p.h. between 5.0-6.0. So you should buffer the spray solution.

    Pete D.
  8. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,100

    I have some Round Up and you got me wondering about it my self. So I e-mailed the people who make the stuff. If any one wound know it would be them. Here is the e-mail I got back

    Thank you for contacting us concerning RoundUp® products. As always, it is our goal to make sure that
    our customers are completely satisfied with our products and services.

    We appreciate your comments on the information on our RoundUp website. We appreciate getting
    feedback on our products and services. We take all comments very seriously, Mr. Henderson, and we
    have shared your concerns with our Website Administrator.

    Roundup Weed & Grass Killer Concentrate has a shelf life of a minimum of eight years. The product may
    last beyond the minimum time period though. Many variables in storage conditions can affect the shelf
    life of a product, Mr. Henderson. Roundup Weed & Grass Killer Concentrate will not be fully effective one
    day and ineffective the next; the product will gradually lose its effectiveness over time. Store both
    unopened and opened product containers in a cool, dry place and protect them from extremes in
    temperature. Freezing temperatures, for example, won't affect the product, but may cause damage to the
    container and could result in a chemical spill. Stored correctly, your product will last at least the minimum
    number of years and probably longer.

    Mr. Henderson, we recommend that you plan ahead, and mix only as much of this product as you will
    actually use.

    You may store diluted Roundup Weed & Grass Killer Concentrate for up to 6 months. After that, the
    surfactant, or sticking agent in the RoundUp, breaks down due to impurities in tap water. RoundUp
    Ready-to-Use products have a 4-year shelf life because they have an added ingredient to prevent this
    breakdown in the surfactant. If you store diluted product after use, be sure to mark the storage container
    to note both the contents and the date the product was mixed.

    Again, thank you for taking the time to let us know of your concerns. Please do not hesitate to contact us
    if we can be of any additional help to you.

    Glen Kussow
    Consumer Response Representative
    The Scotts Company and Subsidiaries
    14111 Scottslawn Road
    Marysville, OH 43041

    Ref # 3038730
  9. tremor

    tremor LawnSite Bronze Member
    Posts: 1,476

    Consumer RoundUp............this website is sinking......?
  10. Garden Panzer

    Garden Panzer Banned
    from Seattle
    Posts: 313

    They forgot the 3 D's of pesticide aps....
    Dump, Down the drain, & Drive off!
    Just kidding, if anything I overpay due to small container purchases....

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