ANSWERS: 3
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If you cut into the bark deep enough around the base of the bush, all along the bottom, then that should kill it. You will have a dead bush to deal with later still.
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I think that there are two ways but neither is exactly euthanasia friendly - 1. Poison it 2. Ring It With answer 2., I don't mean ring as in phone but there's a technique where you can cut partly into the rings (as stated above) or if I remember right from high-school, you can 'strangle' it by putting a metal ring around the tree. You might be able to google 'Tree Ringing'. Otherwise, if it's a water-thirstly bush, just don't water it?
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Pour hot water over it. Else get a black bin liner and wrap it around it to cut off it's sunlight.
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