I've been out surveying in the deep jungles... ok, forests.... fine, thick bunches of trees of Fort Worth and Mansfield and of course there's a lot of things not to grow that don't need tending.
I've kept clear of most of them but the poison ivy just finds a way to get to you. Currently my arms are red and swollen, not bad enoug to stop me from blogging though.
Another of the fellons of the forest would be bull nettle. I have successfully kept clear of the hairy death plants. They say it feels like a jellyfish sting if you accidentally rub up to one. They can go through your jeans and lodge in your leg, but they are low growing and don't climb.
This mean little thorn can reach both the length and the thickness of a pencil and grows all over the honey locust tree. This is not a climbing tree. The thorns start out purple when they're still growing and have a toxin on them that will leave you sore and aching long after the thorn is removed.