The heady fragrance of agarwood gave Hong Kong its name, but it has become so valuable its source is under threat. As Jo Baker discovers, though, there are those for whom the incense tree is worth more than money
Ho Pui-han makes her way along the fringes of a country path, through a patch of trampled undergrowth and then points to a deep gash at the base of a tree.
"You can see where they've cut the wood as a test," says the conservationist. "They'll be back in a month to check and, if it's the right tree, they'll just chop it down and carry it across the border."