First you will not kill poison Ivy with Roundup. Probably the only way you can be sure of killing it is put something such as a disposable rain coat or poncho as well as gloves. You will need a large zip lock freezer strength bag and Stump Killer. Take the poison Ivy vine and put all of it you can into the bag and add the stump killer. Zip up the bag and leave it and let the vine drink all it will until it dies. It will drink until this happens. Roundup isn't strong enough for any hardy vine. You can kill most any tree more or less the same way only you have to bore a hole with a downward slant and place a piece of PVC of equal size into the hole and fill with stump killer and cover with a cap to prevent evaporation. After using the raincoat or poncho they need to be thrown away as all the air borne poison off the poison Ivy. You should also take a bath VERY soon after this operation to help prevent having a large break out of poison Ivy.

Thank you, gardengal, for the info. I will have to watch for berries on that mysterious plant to help identify it. I should find a better word than invasive. They are undesirable because of their propensity to spread and their difficulty to remove. While technically, this is the PNW, this side of WA is very hot and very dry during the growing season, nothing like the Seattle area. Yes, this is somewhat of a woodland setting and there are tall conifers, however, we had many of the tall pines - 40+ - felled to let in more sunlight and we have amended the soil to be able to grow roses. We now have good soil that the roses seem to like. It is possible to grow roses in this setting. One of the most well known rose growers, Northland Rosarium, is in this area, also an extensive, popular rose garden at Manito Park. Since these non-invasive, but undesirable, plants are here, and not bad looking, I will just go around them for the expansion of my garden, giving them plenty of latitude so they do not become part of my garden.

Shearing ivy will NOT kill it......all it will do is help to keep it somewhat under control and from migrating too far away from the fence or whatever is supporting it now. English ivy and wood fences are not compatible. Because the ivy is evergreen and will layer rather densely, it will trap moisture underneath it and that will lead to the deterioration of the fence sooner rather than later. IMO, I wouldn't do either a fence or plantings right in front. You want easy access to the ivy to keep it trimmed back. And in a mild climate, you will need to that often. And I also would not be concerned about the ivy growing with small kids. There is nothing appealing about the plant to encourage little ones to sample (and they should be schooled early on never to sample plants from the garden!!) - the leaves do not taste good and they would have eat a lot to get more than an upset tummy. And if you keep it sheared or cut back, it will never flower or produce berries so that is not a concern either.

Yes, it is.