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In fact you could try the opposite - plant sacrificial slug caviare plants around the ones you want to keep. Might work!
You could start by cutting through the main stems close to the ground - you will need big loppers and/or a saw to do this. This should cause dieback above. I found I could stand on the ground and yank upwards, pulling the ivy away from the wall it was growing up. I'm sure a hedgetrimmer will only cut off leaves and young stems. Sorry but you might need scaffolding to get it off the roof safely.
I've done something similar, used flour and photographed - it did last through a couple of downpours!
Hi sjp2, are you in the UK? Crab grass (Digitaria) is a tropical plant and might well be killed in a bad winter anyway. There are other grasses that have that spreading appearance. But anyway, you seem to have dealt with it.
Don't think it's Reseda lutea, could it be an Artemisia of some kind?
Could be Quercus rubra, Red Oak, which is a lovely bushy tree that sometimes colours well in autumn. Definitely not Liriodendron, I'm afraid.
I'm pretty sure it is Honesty, I've got lots looking just like that in my garden.
I wonder if the white one is some kind of Phlox? The leaves are very fine, not seen one quite like this before.
I'm so lucky, these were here when I bought the house.
I've seen them go for up to £100, depending on size.
Yes, ivy-leaved speedwell. It's going to seed so get it out now!
The first photo is an umbellifer, as Bob says, but not one of the common wild ones. I think it's Ammi majus, which is sold as an annual garden plant.