how to rid poison ivy growing way up into trees?
I have done lots of google searches and can't find this answer.
I have lots of poison ivy, usually a large area under a tree where the PI is growing. I can spray roundup and kill all the stuff growing on the ground. Spraying the leaves at the bottom of the tree kills the bottom leaves, but does not affect the upper 40 feet of PI. That climbing PI drops seeds for more to grow.
Last fall I cut through all the stems of PI and left them in place. My internet searches led me to believe that the top growth would die and I would just have to focus on the ground and roots. But the PI did NOT die, it as green and lush as ever. And making more seeds. This is AFTER severing the stems. I can't spray any higher than 7 feet.
Has the PI rooted into the tree? How can it keep growing when it is severed from the roots? How can I stop this?
Help! I'm really allergic and need to get rid of this stuff.