Pan Greenwood

I'm on year eight of consistently chopping my willows to the ground 3 times a year or so, with zero apparent trouble for the willow. Thermodynamics be damned, willows are full of necromantic energy, and when killed - they rise again.

Cottonwood is taxonomically a close willow adjacent. I wouldn't anticipate it dying.

That said - cottonwood is amazing medicine, great fire board, fabulous carving, lovely baskets, and decent firewood. It's a tree I cultivate on my homestead.

As a tanner, I just want to weigh in and say that bark loses more than half of its tannins in the first couple rains. Unless you're working with wood that's been seasoned undercover, excessive tannin content shouldn't be an issue.