We don’t stay rooted to the spot and neither do trees. All living things have strategies to move to places where they can thrive. How do trees do it? Which are the winners and losers in the race for the best spots? Which are the trailblazers? Which trees have used other living things to travel round the globe?What are some of the human stories which mean that we have welcomed exotic arrivals from all corners of the earth? We don’t need to travel far to see some interesting examples.