@gardenfantic, dito. I've had mine for a couple of years and they look great against the yellow leaf of my Spiraea Goldflame, but I planted over them last year and I think I disturbed a bunch of them so that there was leaf this year but no flower.
I plan to get loads more this autumn for the middle garden, along with as many Tulips as I can afford
I'm also going to be dividing my Eremurus which is about ten years old and with the twenty flower spikes this year, I think it won't mind the separation.
My objective for next year is to improve my drift planting technique which is rather crap this year as I am beginning to discover too late in the season to change it, but oh hum, t'is a learning curve and next year will be even better once my perennials have bulked up