My daughter has just moved into a ground floor flat with an established rear lawn of very many years. However, it is full of a variety of broadleaf weeds. The grass that is showing looks to be of good quality.
Lawn size approx 40 feet x 20 feet
We don't want to dig it all up due to the work involved. Would it be best to try and treat it with a lawn weed killer or kill everything with something like roundup, glysophate weed killer and start again?