Personally, it is easier for me to mow than to weed large areas
In defense of turf, its primary purpose in a residential setting is to provide a fire break. Lavender, being an oily herb, is much more flammable than other planting options, including most native species.
Turf also reduces cover so as not to provide shelter for unwanted critters. Lavender can be harmful to pets, I'm told. Opinions seem divided as to whether or not it repels rodents, snakes, etc. Definitely a pro if it does indeed repel the property damaging creatures.
Lavender is susceptible to a number of pests and diseases. Are you prepared to deal with 6000 square feet of dead monoculture in your front yard in the event of a serious outbreak?
To each his own, so they say, but we are also charged to love our neighbors. That can be challenging enough even when "our own" coincides with "their own." Will doing this start a turf war (pun intended)?
Lastly, does it have to be all or nothing? What is the benefit of going all in at once, versus doing a phased trial?
