I
have heard of some bark being treated with herbicide to enhance the value as
a mulch to keep down the weeds.

Come to think of it most of the Sequoia bark was packaged and sold as mulch in
western states. I think the bag even has the word mulch on it.

I've been using Sequoia bark for over twenty years ever since Wyerhouser got
out of the bark business. Now that was some nice bark all kiln dryed.

I'm going to check with the nursery where I bought the bark to see what they
say. I think I already know the answer.