Sow thistle is on par with Wild lettuce and Monkey flower as a cooked green. It may not be the best wild edible, but it works well to round out some of the better tasting cacti fruit and legumes.
A passage from Wild Edible Plants of Texas:
A weedy non–native annual, look for the Sow thistle in disturbed soils such as vacant lots, walkway sides, grassy park edges, and secondary roadsides.
