Know your enemy. Plant ID in the Azores

My Grandpa's land has been invaded by this plant for some time now. it grows about 3-4 feet high, can get pretty dense at times. Its fairly easy to pull out of the ground by hand, but most of the roots (which look like 1/2 inch thick branches, milky white on the inside) stay behind.

i've added some images.

if anyone has some info on this plant, i would really appreciate it.

Thanks

Looks like bracken ferns to me. Try this: bracken

I've seen it used for the undercoat on a thatch roof building in this video

Craig Thank You! Bracken matches up. its nice to know something about what i'm up against.
and the video is pretty cool, i plan on watching the whole series when i find some time.

take care