The cardiocrinum or Giant Himalayan Lily takes from 5-7 years to reach maturity. The flowering spike can be up to 10 feet in height. Ours have been between 5 - 7 feet. The flowers are enormous creamy trumpets with a pink flush.
After flowering the bulb dies but produces offsets and seedlings. Ours are at varying stages of maturity and we hope another one will flower this year. We bought ours at Cluny House Gardens where they can be seen in all their magnificence. http://www.clunyhousegardens.com/
Last years flower spike
The spike turned into this...
The seed head is a work of art.