I used to have that strain, too, but the one plant I had left up and died after a stealthy white fly infestation. fuckers! And, to be honest, I got out of plants and propagation to some extent when my kid come onto the scene.
Anyway, I've yet to get either the WH (I had) or luna to flower. Several years ago I'm fairly sure that one of my WH was trying to flower, but then the tip went brown and it died off. I'm in zone 7a but it's possible that I've never put them in a big enough pot. They're not that hard to grow but they're finicky at times and branches will die off unexpectedly. I've never had a plant get up to 4 ft. tall. It could be that they need to be larger, older and more well-established (and perhaps climate comes into the equation) in order to flower.
I really don't know, but so far I've been able to keep at least one plant growing for nearly a decade. I hope to make some cuttings with my luna in order to guarantee that my very last plant won't indeed be my very last plant.