Stay away from the weeds and rocks and you won't have to worry about them.
In autumn the withered weeds are torn up by the wind and driven immense distances.
Plants as agents of damage and disease may be divided into those larger forms which as weeds, epiphytes and so forth, do injury by dominating and shading more delicate species, or by gradually exhausting the soil, &c., and true parasites which actually live on and in the tissues of the plants.
The lawn, if it could be called that, was overgrown with weeds and sadly in need of mowing.
After this treatment the upper 2 or 3 in, of soil are well pulverized, and fertilizers added, usually, to prevent reintroduction of seeds of weeds, in the form of guano or chemical manures.