Hymenocallis narcissiflora commonly called Peruvian daffodil or Spider Flower has intricately designed flowers and fragrance. This bulb is native to South America and Africa and hardy only to zones 8-10 in the US. This is my second year growing these bulbs and I have yet to experience the fragrance that I read so much about. Last year the bulbs bloomed at six inches but this year the stalks grew to two feet before it started to bloom. The first year I had them there were only two blooms per stalk but this year each stalk produced between four and five blooms.
Here in Chicago they wouldn't survive the winter in the garden so I have been growing them in posts and treating them similar to Amaryllis bulbs in the fall. By that I mean that around October I start withholding water and allowing them to dry out and go into hibernation and then I store them along with my Amaryllis bulbs. If you prefer you can grow them in the ground in your garden but make sure to lift them out of the ground when fall approaches. They're great in containers and even after the flowers have faded you still have glossy, strap- like leaves to provide interest.
My attempts at hand pollinating the flowers have proven to be unsuccessful and I have not observed any beneficial insects visiting the flowers but the bulbs seem to be propagating themselves through offsets.
I purchased my first four bulbs last year at a garden center and the packing said to toss the bulbs and keep the offsets it produced the first growing season. Given the amount of blooms they produced the second year and how much they grew I have to disagree with the advice on the packing and assume it is just an attempt at selling more of these bulbs.