Since we’re not filming until Tuesday, and since today is a sunny day, I decided to do some yard work. Ah, yes, raking leaves! And then burning them. What an odious task.
I noticed that ivy was crawling up one of the chimneys. I’d noticed it before, only I’ve been busy. You know; being lazy, having mates over to cook giant slabs of dead bovid over fire, crabbing, getting started on the film… Yeah, there are always a lot more fun things to do than yard work.
But I decided to deal with the ivy. I tried yanking it down, but the vines would break. I removed a bunch of it though. I think I separated it from the ground. After I got tired of that, I doused the area heavily with grass- and weed-killer.
[ul][li]Will the vines that have been separated from the ground still grow?[/li][li]Will the weed killer kill ivy?[/li]What’s the best way of killing ivy?[/ul]
Aha! An excuse to buy a flamethrower! 
I don’t know what the poison was. I don’t really want to pull it out of the smelly bin. Could’ve been Ortho, may not have been. It came in a gallon jug with a spray attachment.
Creeping ivy is a tremendously redundant system. If you whack the obvious conection to the ground, the hundreds of other connections its made to the brickwork and whatever else are most likely enough to find enough moisture to sustain it.
It is VERY DIFFICULT to eradicate and very pervasive. I used to live in a house that was infested with ivy. The stuff snuck in through cracks in the chimney and was alive in the walls and eventually found a crack in the inside wall and one day we came home to find ivy in the living room. In my book, it’s every bit as bad as vivax bamboo, which I’ve seen find its way across four feet of concrete to grow on the other side of a sidewalk.
Your spray-on weed killer probably was Roundup or one of its cousins. Let the stuff work for a week, and then physically go after what’s left and be vigilant about grabbing anything that tries to re-appear.