A Comment for the PBS: Lycoris squamigera and bloom triggers
Blee811@aol.com (Wed, 05 Aug 2009 10:14:25 PDT)

Since the two groups of Lycoris were obtained from different sources, the
differing bloom times may be as simple as their origins. It is quite
possible once they are acclimated to your garden that they will all bloom at the
same time next year.

Bill Lee