Isobel Chetwood of Knutsford, Cheshire, discovered bamboo shoots bursting through a raised bed in her garden, having spread from her neighbour’s property. When weedkiller didn't work, a mechanical digger was needed to excavate the network of roots embedded beneath her patio. It cost a jaw-dropping £10,000 to rid both properties of the pesky plants, according to plant removal specialist Environet. "I’d advise anyone thinking about planting bamboo to avoid it at all costs," says Isbobel.