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Clusters of blue-black berries.
Wichita Forest Park.
Greenbriar, according to Merriwether's Guide ti Edible Wild Plants of Texas and the Southwest, is one of the best wild foods available as it can be found in immense quantities all year-round, tastes really good, is very nutritious, and is a source of calories (tubers). Greenbriars are the only vines that have both tendrils and thorns making them easy to identify. To find the edible tips just pull on the greenbriar vine until you get to it's top end. You can eat any soft, tender portion of the plant (stem, leaves, and tendrils). The vines may grow as a single stalk or branch out into many vines ranging in diameter from 1/8" to over 3/4". Multiple branching vines are more common with smaller-diameter plants. These above ground portions of the plant can all be eaten raw, the leaves and tendrils can also be cooked like spinach, and the vines can cooked like asparagus. Track the thickest vines back to their buried tubers. These tubers can form a mass up to 75 pounds but are difficult to dig due to their many long roots. The starch produced from the tubers may have an astringent, unpleasant taste but it is rich in calories. It is exceptionally good at thickening stews and even water to the point of becoming almost Jello-like. Native Americans would slow roast the tubers under a fire for several days, then chew the cooked starch out of the tubers and spit out the fibers. The youngest tubers are the best to harvest. They will be the lightest in color though the color may be white, light pink, light purple or light yellow. The starch was also collected by slicing the tubers into 1/4" disks, letting them dry in the sun for a few days, then crumbing the disks in a large bowl of water. The granules of starch fall to the bottom of the bowl and the fibers float to the top. The water and fibers were discarded and the starch was dried and then ground up for use as flour. It still has a bitter taste but it'll give you calories.