How do I get my Grammatophyllum scriptum var. tigrinum to bloom?

[got ants]

I've had it 2 years and I thought maybe last spring it would bloom, but it didn't. Maybe it was the severe cold we had, maybe my growing. Has anyone grown this outside in south Florida had it bloom? What culture should it have?

It's planted in a wooden basket, about 10 plants, with 6 older bulbs, it should be mature, right? Does it need a dry winter rest?

HALP!