In my experience the spring is a huge season for phal blooming, both my own and greenhouses visited, but that's a very fluid definition. Spring could be Feb-Jun. Many plants also have minds of their own, and phals can be such long bloomers that they throw they're own sched off if they're really big and healthy and bloom more than once a year for extended periods.

I'd call Spring phal season, but I wouldn't hold any one plant to it!

Julie