Compost King
Free Ranging
https://www.bonide.com/assets/Products/Labels/l330.pdf I use this on Poison Ivy. I don't even worry about my chickens when I apply it and I have never had a problem with chickens getting sick when I use it. The label says its harmful to animals and humans but they are being overly cautious to avoid law suits, I have spilt the concentrate on me and the diluted version... not even a rash or any irritation. It evaporates fast. Unless your chickens are eating the poison ivy I doubt they ingest it after applied. Removing the roots is futile, the organic methods could take years if you have a big infestation. My nursery offers Poison Ivy removal as a service because I do it so much cheaper than landscapers. I may not always use that brand name, I will use any of the brand names that have the same active ingredients depending one what the garden shop has in stock when I buy it every spring. Just apply it in the morning before a hot clear day and before the sun goes down the leaves will be wilting and dying, by the next day it's dead, and shortly after that the vines and roots die too. If your infestation is really bad a 2nd application may be needed. you do not even need to to get every leaf. This product kills many different plants but not all plants.
I try to be organic but when it comes to Poison Ivy it can be futile, if there is any time to cheat its when it comes to Poison Ivy.
I try to be organic but when it comes to Poison Ivy it can be futile, if there is any time to cheat its when it comes to Poison Ivy.