When left undisturbed, naturally-occurring vegetation tends to grow back year after year. In agriculture, this is also true of perennial crops such as olive trees, asparagus, many types of fruit, and grazing crops for animal consumption. However, agricultural grains, which make up over 70 percent of global croplands, are almost always annual crops that need to be replanted every year.
— Read on geneticliteracyproject.org/2023/02/21/grains-make-up-70-of-global-cropland-heres-how-perennial-grains-legumes-and-oilseeds-could-dramatically-improve-sustainable-farming/