Honeysuckle is killing forests and ivy is helping, especially in the northeast/midwest. Kill all that shit, help stop it from spreading. And try to volunteer for local groups that are clearing invasive species. It's pretty amazing seeing a forest before and after invasive species have been removed.
Lets see... we've got the invasive asian honeysuckle, tree of heaven and beef heart plant.
The honeysuckle is actively detrimental.
The beef heart plant is weird, it grows kinda slow and takes over shaded fields when we have a drought year but when there's rain the local flora seems to be able to compete with it. Has helped keep the dirt in place during drought years.
The tree of heaven that we've found around here are fast growing tree that spreads through seed and through a parent's root system. Shit's crazy. Smells like peanut oil when you cut them down.