I was actually going to look into adding this, because the topic came up when trying to find a frame for earth walls that didn’t require nails (forging, by extension), eventually settling on the light wooden frame. I found that early shipbuilders used pegs made from green wood, because it naturally expanded, and it struck me that fibrous stalks are basically green wood, and they don’t have much use at the moment. So… instead of forging nails, go stab some triffids?