Can I use wood from outside in my tank?

Hi!
I was wondering if it would be safe to use wood from the bushes in my back bush on my property in my tank. I would get rid of the bark and boil it. Would it effect my tank or fish in any way? (I was planning on mostly just wood like thicker twigs, 1/2 inch thick maybe at the most)

 

If they are fresh green twigs, no. What kind of bush.

 

If they are fresh green twigs, no. What kind of bush.

Birch trees. There's oak back there too.
I plan using old stuff that has fallen on the ground.

 

Well if you can find dead trees, go ahead. Live trees, no.

 

Well if you can find dead trees, go ahead. Live trees, no.

Okay, thanks.