Populations of weedy rice are found in many rice-growing regions.
[1][2] Weedy rice varieties generally have fragile stalks that self-seed before harvest.
Variations of weedy rice adapt to a wide range of natural conditions.
This term, however, is not all too fitting, because red pericarp is also found in some cultivated varieties, and is absent in many forms of weedy rice.
It has become very significant since the mid-1980s, especially in Europe, with the weak semi-dwarf varieties of indica subspecies.