I would spay with 2,4-D. I did that to a patch and it is looking good. Thistles very much dead.I have a great stand of CIR/Kanlow switch, thanks also to Paul and this site. A couple days ago I mowed all of it short to the ground when I saw just how much Canada thistle and poison hemlock were in it. Since it's so early in June and we have tons of moisture, I'm not concerned about getting all my growth back by August. But would any of you guys still try to smoke the thistles by spraying it all with say Crossbow just as things green back up in a week or so? Or would you think the switch will come out of the gate strong after the mowing and dominate at least just for this year while the thistles are hurting, and try to get them sprayed out next year earlier in the season?
In my experience, Canada thistle is not controlled well with 2,4-d. Looks dead but regrow from roots almost immediately. Have had better luck with Milestone but even that’s far short of a sure thing! I would spray with that and then hit it early next spring withGly. Once you have it in grass, I think you’re in for a never ending battle. Wish Canada would take this one back!!!
Hit it with grazon , kills it dead, even when tall.I have a great stand of CIR/Kanlow switch, thanks also to Paul and this site. A couple days ago I mowed all of it short to the ground when I saw just how much Canada thistle and poison hemlock were in it. Since it's so early in June and we have tons of moisture, I'm not concerned about getting all my growth back by August. But would any of you guys still try to smoke the thistles by spraying it all with say Crossbow just as things green back up in a week or so? Or would you think the switch will come out of the gate strong after the mowing and dominate at least just for this year while the thistles are hurting, and try to get them sprayed out next year earlier in the season?