Spot spray the thistles and brambles with grazon pro.
Spot spray the rushes with headland thrust. These are the two legal options for knapsack use.
I suspect blanket spraying will wipe out or severely hurt your plantain no matter what you use.
Wont touch brambles but good on rushWhat about MCPA?
What about MCPA?
My experience is that you’ll be back spot spraying again and again with mcpa. Also not legal for a knapsack sprayer
Why not legal for a knapsack? Too dangerous?