Aren't they they most glorious plant? And they're big, taller than the house and ridiculously easy to grow. They have a pretty, if slightly triffid like, foliage during summer. Ideal for renter's gardens, for places where you want something big, quickly, or for the back of perrenial beds. You would think that they'd be a weed or a pest plant but they're not so rampant that you couldn't get rid of them if you wanted. Best of all, they bloom just as you realise that winter's really coming and that you're going to have to start wearing shoes, closing the house and turning the heater on.
They're likely to bloom for about a month, unless they get blown down by high winds. Then we'll cut the canes down. If anyone (in Australia) would like a cutting, let me know.