Hi cbeule
According to Orchidwiz, the reasoning behind the roots growing over the pot is to expose lots of roots to the air. It suggests they get maximum sunlight and very strong air movement. "Plants grown with enough light have pale yellow leaves and pseudobulbs"...the strong air current is to prevent burn. Air circulation should be strong at all times.
They bloom late spring - summer.
Our members love to meet our new friends and learn a bit about them and what they are growing. IF you'd like, you can leave a little intro in our Introductions - Break The Ice forum
What other orchids are you growing?