Deal with pesky weeds before you create your herb lawn
Resist the temptation to take short-cuts. Clear the area of weeds before you establish your lawn or you’ll forever be pulling them out. Lift the turf with a spade to a depth of about 5cm, then dig over the whole area, pulling out the weeds. Add compost or grit if necessary. Work this in. Leave to settle, then spray with Roundup two weeks later to target any emerging weeds, or dig them out, ensuring you remove the roots as well.