i am in New Orleans (zone 9)
i got a couple of plants 4 to 5 years ago
3 years ago, i had several flowers in the spring.
last year, i only had a couple.
This year, i had none at all.
This year we had 1 night that hit 27F,
but the rest of the winter was VERY warm.
If it needed chill hours, it didnt get any except that 1 night.
now, it may be rainfall patters why they didnt flower,
we did get a lot of rain in the spring, and they are still pretty young
so,. i am not really sure why they didnt flower.
Not sure this helps much... LOL, but thought id share.