Dabbling in duckweed: environmental uses for a green menace

Despite its troublesome reputation, the weed blanket smothering ponds and waterways also has its virtues as a biofuel and foodThe hot weather has been a boost for plants, and especially weeds. The heat triggered an explosion of duckweed that has smothered many canals and ponds, especially in London, where some waterways have been choked with carpets of duckweed so dense they looked like garden lawns. In fact, the Canal & River Trust recently removed 70 tonnes of the weed from canals in Londo