It can be difficult to grow from seed.  Follow our Germination Code E (below).  We are quoting William Cullina of the New England Wildflower Society and his book Guide to Growing and Propagating Wildflowers:
"...they are certainly slow [from seed].  Germination is two-stage, with roots and bulb forming in fall and the thin, grasslike cotyledon emerging the following spring.  It is best to leave the seedlings undisturbed for a year or two, then transfer them in the fall to larger containers or a growing bed.  They will take up to five years to reach blooming size." 

Seeds / Packet: 10
Seeds / Ounce: 2,000

Dormant bare root plants ship each year during optimal transplanting seasons: Spring (April - May) and Fall (October).