Year after year its been the same but some varieties tend to pitcher greater at certain times of the year. For example I get alot of pitchering on varieties from Mindinao later in the season. Some of the Malasian ones throw out a brust early in the spring. As I said I get the oddball that flowers whenever. For example in the spring i may have a half dozen male spikes in bloom but only one female but can cross all on that one spike if the timing is right.
Timing is the headache.
I have for some waited from seed to flower 10 years and thirty feet later just to get a flower and be off by a week with the opposite flower. Oh well maybe next year. I've tried storing pollen but so far have only one cross and that I have not confirmed yet until the plant gets some size to verify.