Britain is being invaded by foreign plants, and the cost of controlling these alien species is increasing. But is this battle worth fighting? As the global climate changes, our native species are likely to suffer first: plants originating from sunnier parts of the world are far more likely to survive. Our gardens are filled with around
15,000 foreign plant species, with a mere 1,500 native to our soils. Quentin Cooper asks whether this matters. Producer John Watkins. E-MAIL: material.world@bbc.co.uk Internet supplement: centre pages