most plants are hard to kill if you let them seed! sort of counter productive isnt it? one plant puts out a thousand seeds so you spray after the seed head burst so you can get the parent plant?. I know exactly what you mean though,your treating them like a half shrub. try spraying before the seed heads form fully, kill the top and you kill the seed .you wont kill the plant entirely,but youll stop its seeding,next year youll have less,spray again and youll have even less. another thing,try something besides 24d.it has very little residual. a product like chapparal might be better if you spray now. youll see a reduction next year.the trick is to break that cycle, but youve got to do it twice. and yes i do know what canadian thistle is,here in this state its against the law to have them in your field without doing some sort of control. big fines IF they enforce it. trouble with spraying in the fall here is its often too hot for spray to be effective. most folks here simply mow them often enough they cant seed in the fall,then spray in the spring with a herbicide with a good enough residual to cover the carb movement you describe. could just run some old cattle in there,here they eat them like candy! wont find one in a pasture here unless its sitting idle or its very understocked.
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