Tigridia pavoniana can withstand both wet Winters and wet Summers in the ground in Britain - (zone 7 or 8), as well as prolonged freezing conditions. I know of some CORMS planted many years ago, against a wall and shelterd by a cherry tree, which flower about every second year.. I would not say that they do well, but they can survive winter moisture.... Tigridias have corms not bulbs. if you half one, and half a dutch (or reticulata) Iris bulb you will see the difference. Use a Crocosmia or Gladiolus corm if you cant spare a Tigridia Peter (UK)