Basagran is best option for thistles.

Flexstar may have hardened off GRW if it did not completely kill them.

Used Basagran and Ultra Blazer combo for years. Make your own or premix is called Storm. Will see bronzing & bit of burn under hot humid conditions but seemed less than Flexstar burn to me. Combo will get small GRW but not complete kill on larger ones.

Be advised Flexstar has 10 month rotation limit back to corn.