Ortho Groundclear- How Dangerous?

Discussion in 'Pesticide & Herbicide Application' started by tallguylehigh, Jun 27, 2008.

  1. tallguylehigh

    tallguylehigh LawnSite Member
    Messages: 22

    I would first off like to introduce myself and say hello. I found this site while looking for information on lawn care and it looks to be an excellent resource for land and hardscaping. :clapping:

    I recently purchased some Ortho Groundclear to use on a slate patio that I have in my backyard. The vegetation killing, year long protection sounded good. However, after reading the label (something I always do now) I noticed that in the disclaimer, it explains that you shouldn't spray Groundclear within twice the diameter of the trunk of any trees as well as the drip zone which is visually shown as the area covered by the canopy.

    Here's the catch- on either side of my patio are two MASSIVE oak trees. They are amazing and provide the back patio with great shade, aka "drip zone."

    The LAST thing I want to do is spray this Groundclear, kill the weeds and somehow damage the oaks. Should I use a weaker weed killer (Round up) on this patio instead of the more potent Groundclear because of these trees?

    I have included a picture of the patio to show the proximity of the oaks to the patio and weeds in question.


    Thanks for any advice you could provide. :)
  2. 2stroke

    2stroke LawnSite Senior Member
    Messages: 261

    yes... i think it would be very bad to put the ground clear down in that area. use repeated doses of Roundup.
  3. Whitey4

    Whitey4 LawnSite Silver Member
    Messages: 2,448

    Do NOT use the Ground Clear here! It will enter the root system of those oaks and cause some damage! This stuff is potent, and will leach into the root systems of nearby trees and shrubs, as it does have a long residual.

    The right product here, on the retail Home Depot/ Lowes level is "Extended Control RoundUp". Safe to use near established shrubs and trees, but has to be used about every 2 months (not the 4 months they claim).

    Thank goodness you read the label...... far too many people don't.
  4. tamadrummer

    tamadrummer LawnSite Bronze Member
    Messages: 1,102

    As long as you are just doing the cracks, you should be ok. Don't go crazy with the stuff. It is a ground sterilant and it will kill the trees if you go too heavy with it but if you just spray the stuff you want dead with little to no extra drips off the plants after they are sprayed.

    Otherwise, go to Lesco and buy some ProDeuce and spray it. It is a pre/post emergent.
  5. Whitey4

    Whitey4 LawnSite Silver Member
    Messages: 2,448

    That light foliar spraying technique defeats the purpose of Ground Clear as a pre-emergent herbicide.... if it is to applied as per label instructions for maximum pre-emergent effectiveness, the ground (growing medium) must be soaked. Much better to use RoundUp if it is going to be applied as a foliar spray.... and much cheaper. It's the wrong control here..... sure, if it's not applied as per the label, just a leaf wetting, it will do what most post-emergent non-selective herbicides will do... kill what is up and growing. Waste of money.... Roundup will do the same thing at less than half the cost.
  6. tamadrummer

    tamadrummer LawnSite Bronze Member
    Messages: 1,102

    Thanks Whitey :) I thought it might have to be put down like prodiamine but figured if he were to use it like Roundup there would be enough residual to keep it down for a few months.

    Listen to Whitey, he is a licensed applicator. I am not for lawns, just for flowerbeds at this point and brand newly licensed at that.

    Good luck and let us know how it goes.
  7. heritage

    heritage LawnSite Bronze Member
    Messages: 1,351


    You saved the Day.....And a tree.

    Thank You.

  8. greendoctor

    greendoctor LawnSite Fanatic
    Messages: 9,976

    Ground Clear is imazapyr, that is not something to be used within the root zone of desirable trees. I am constantly amazed by what is sold to homeowners. Imazapyr is Arsenal herbicide. This is used to kill EVERYTHING in right of ways, industrial areas and noncrop areas. There is a product called WeedStop or WeedStopper. This is oryzalin, a preemergent herbicide designed for use around trees and desirable plants. At the right dose, most weeds do not emerge for an entire season. This a a good thing to use with RoundUp, because it has no effect on emerged weeds.
  9. Ric

    Ric LawnSite Fanatic
    Messages: 11,969


    I have a customer who Didn't Read or understand a Label and applied Shara to his landscapes beds in hopes of not having to spray Roundup as often. He now in the slow process of affording to removing over 20 pine trees in the 40 ft tall range. When treating his property just two days ago, I saw he planned to expensive Palm trees and I don't believe enough time has past.

    LIBERTYLANDSCAPING LawnSite Bronze Member
    from Indiana
    Messages: 1,283


    Round-Up + Surflan (Oryzalin) is the way to go! When I can't afford any weeds, I also add some Gallery to cover more broadleaf weeds:)

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