Tried Roundup and no results. Got the concentrate. Cost me 30 euro for 500 ml!. Loaded it into a backpack sprayer as per instructions. Have given them 2 goes now and they havnt even wilted. Am digging them up today! Will try homemade next time
Give it time. The roundup needs to get from the leaves your sprayed into the roots, it then attacks the roots and eventually the plant dies. Might take a week to see results.
Time is a great killer.