Possible Clues:

• Some species in this genus have very large leaves
• Arsenal player given a giant rhubarb
• Waterside ornamental plant with very large leaves
• Giant rhubarb-like plant
• Soldier given a big plant
• Man marooned on Treasure Island long time finds large-leaved plant
• Very large-leaved shrub
• Member of RA introducing "A Herbaceous Plant"
• It grows in Georgia, overrunning centre of convent
• Plant weapon on a number of characters being followed by FSB