I don't recall if it was the biggest, but it was definitely the oldest. 2 dirt roads intersected right over a very narrow, very deep hollow that turned into the road ditch a little further down. This hollow was no more than 20 foot across the top, but over 30 feet deep. More like a gorge than a hollow. I parked right at the intersection, walked along the top of the gorge about 10 steps in off the road, and I saw a medium sized little 3 prong top. Dug it up, and counted over 60 growth scars on the neck. That was the only plant I found in that area.