Since Arkansas is severe drought, that may cause the astringent taste because plants are stressed. You don't have to cook that long, it's just my lazy cooking. Besides, I didn't bother to harvest many to make an entire dish. I grew up eating the giant type, maybe a kind of moso, that one shoot was more than enough to serve a whole family. Short ones that look like traffic cones were younger and tastier. We only ate modestly each time as people said too much would cause indigestion. The peeled shoots was cut into fine threads similar to those of potato hashbrowns and blanched in boiling water. Then drained and sautéed with some meat.
Do you know what variety it is? I am still trying to figure out what I have.