The three that I can think of were IMM X pollen from CELEBRATION SONG
(one fall cycle out of ~50 surviving seedlings), GACG13 (GOLDEN APPLE X
CRYSTAL GLITTERS), and STUNNING SERENADE.
Hard to evaluate how "serious" these all are about rebloom, given my
growing conditions, but the first one is old enough and I have enough of
it planted to say it is definitely a cycle rebloomer. The second one
has fall cycle bloomed in one new clump the last couple of years (GACG13
has never rebloomed, but isn't that great a grower). The third is too
young to know for sure, but rebloom was not maiden bloom.
CSONG is in the rebloom checklist, but only from OR, WA, & Oz, & I don't
know what time of year it was reported to rebloom.
<When you get Fall cyclic rebloors from Immortality, is it from a cross
of Im X oncer or a cross of Im with a cyclic rebloomer?