..... another factor on certain varieties lack of bloom reliability COULD .......
( posing a theory based on my experience only)
.......be their sensitivity to certain climactic factors. In winters here in NE Oregon that have had a wild variability in temp swings, especially in the fall, ive had cultivars that historically bloomed well, ghost on me as far as bloom goes the following year. The embryonic bloom points deep within certain varieties rhizomes could be more sensitive to sharp or extreme environment changes. Same goes for excessive heat, followed by cold, drought followed excess moisure, etc. Proto cellular leaf structures seem to be hardier within the rhizomes, but bloom points may be expendable.
The varieties region of origin seem to run the gamut for this phenomenon, but the originating regions for cultivars most apt to ghost on me as far as bloom goes seem to be most often the Aussie, California, or varieties originating west of the Cascades in the PNW
