Hi, Xi,

I will answer this only with respect to winter blooming Phalaenopsis. It's
my understanding that Phals in our collections aren't really being 'forced',
but rather exposed to conditions that mimic what they would encounter in
nature at a given time of year. I grow outside here in FL, and the weather
naturally cooperates in late October, November and December by giving the
plants the drop in temperature that they require to spike, without any help
from me.

For those growing in greenhouses (and I am no expert on that, having never
experienced greenhouse growing), I expect that they need to manipulate the
diurnal temperature range for these plants.

Now, what I consider 'forcing' would be done by a commercial grower in order
to have blooming plants for shows, etc, during a season when they would not
generally be in flower. I don't see anything wrong with that, but the plants
will likely return to their normal blooming season afterward, possibly
taking a season off to get some rest.

Just my understanding.

Diana