We totally no zombies will help you so you can won easily.
first 1: dont plant any plant
secont 2: Wait for the zombies to get to the end of the lawns and let get them kill
third 3: Repeat it until all lawnmowers are gone an let the zombies enter your houze they friend; ~Sincerely your helper (not the zombies; AIN'T READIN' ALL THAT