I have been watching this with interest, I wouldn't touch Schizostylis with a barge pole but I do have Crocosmea Lucifer in my basically USDA zone 8 garden and I like it very much, it flowers in mid summer when its very bright flowers are most welcome and I have not found it to be invasive, if it was I would still want to grow it but it would need to be in a large container. Its a great tall plant for the garden, Lyn Edwards