Alright here's one for all the gardeners out there, Iris plants in particular the new shoots that sprout up if you let the seed pods drop, what is the best way to deal with them and if you use a spray what have you found to be most effective? Round up/glyphosate doesn't work on them you need something a little stronger.
I've tried a spray with this ACTIVE CONSTITUENT: 50g/L TRICLOPYR PRESENT AS BUTOXYETHANOL ESTER and a holding agent which sort of worked but wanted to know if anyone has a better option.

I was thinking of trying a vinegar solution but any suggestions would be helpful.