In addition to nettle roots you will need to completely remove any
other persistent rooted weeds such as ground elder, dock and thistle -
often found in conjunction with nettles. Hard work is the only
surefire way to rid yourself of these weeds without recourse to
glyphosate (Which kills everything it touches).


I'd leave things for a while then glyphosphate any new weeds that come
up. Generally speaking in a lawn, once the grass has taken hold the
weeds don't grow so much and regular lawn weedkiller will work but
weeds will appear in the borders especially where you disturb the soil.