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Need Help with Canada Thistle...

Discussion in 'Landscape Maintenance' started by garden.nanny, Jul 21, 2010.

  1. garden.nanny

    garden.nanny LawnSite Member
    Messages: 29

    I've read several older posts on how to begin the control of Canada Thistle and I just would like to know if what was posted will work in a particular situation I have with a customer. I know it will take many many months of continual attention on the re-emerging monster, C.T., but I want to give my customer some concrete answers.

    My customer bought a brand new home that sat empty for 2 years due to a builder going bankrupt. It was cheaply landscaped with little plant coverage and C. Thistle took over all the beds. The day they closed the new owner cut down all the thistle with his weed eater to about 6 inches above the ground. I need to do something to start to get this problem under control for him.

    My questions:
    How effective will it be to use Round Up Pro on cut vegetation?
    Can I use Lontrel on cut vegetation and if so would I be better in the long run to make the investment in buying the Lontrel or would RU be just as effective?
    Will PreenPro be OK to use for a pre emergent on any seeds that were launched this year?

    Any and all help would be greatly appreciated!

    Thanks a bunch!!
  2. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    Roundup will work, but I wouldn't bother replanting until you see where it comes up again fom the roots. Once you get that stuff running under your plantings, you will work even harder to get rid of it, over many seasons.
    I woud spend this season, killing the thistle and hope it is ready to go next sping.
  3. fireball756

    fireball756 LawnSite Senior Member
    Messages: 474

    You might want to read the Casaron 4G label. It will control thistle if you apply it the right way. Depending on your location, you might need to apply in January so you missed it for this year. Roundup works but you have to use a higher solution rate to get more translocation to the roots. Thistle has a tremendous root system and you have to keep on top of the new growth to get any type of control with post emergent like roundup. Weed whips work good on thistle when it is growing in other plant material
  4. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,719

    No date at the top--but--I think this is an old thread. July 2010.
  5. fireball756

    fireball756 LawnSite Senior Member
    Messages: 474

    You are right Riggle. Thank you. This new software program has me walking around in amazement. I guess we are all doomed to look at old posts for the rest of eternity. I think the garden nanny was eaten by her charges

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