I am looking for some advice on how best to get rid of lantana that is growing at the back of our garden. the problem is that we have a rockface at the back of our garden that at the top goes to our back neighbours gardens. This rock face is is probably about 12-15 meters high (sorry not really good at guessing heights of things but would be higher than a double story house) and it is this rock face that the lantana is growing on /down. Our outside ladder would only allow us to reach the very bottom of the lantana. Part of when it starts is also inaccessible from out land! (I hope explaned what is looks like clearly enough).

Does anyone have any ideas who we could look at spraying this so that it dies. Its quite thick and covers quite a bit of the rockface already - some of which is on their land and some ours. Given the difficulty accessing the rockface I would think it should all be removed rather than us removing/killing the part that is growing on our rock!

i don't know if there would be some sort of industrial type weed killer I could hire from Oliver Hire or a similar type of hire place?

Any ideas however made welcomed!