Brassia Orchid Refuses to Bloom

[starsnrockets81]

Hi all,

I received a Brassia Orchid last June (6/2010) and it had big beautiful blooms then. Three different spikes. After about a month, the blooms fell off and spikes dried up. Since then, I've cut off the old spikes and repotted the plant in March of this year (3/2011). It has been sitting in a northeastern-facing window with medium-low light since I received it. The leaves are bright green and the plant has been growing a lot, but it refuses to grow a new flower spike! What can I do to encourage new blooms?

FYI: I water it about once a week and fertilize every other week with a weak mix of some general orchid fertilizer I got at Home Depot. I also mist it every few days with water. The plant is mostly at room temperature, and I live in Massachusetts.

Any advice would be greatly appreciated!!