Flower Show

I'm thinking about going to the flower show that's in the city, how does one compose flower shots? Is macro necessary? What lens should I use for shooting flowers?

I suppose it's too late, but iff you use a decent flash and are allowed a tripod, you can add a diffuser over the flas and get nice black backgrounds. That's how I do it. I use a sigma 105 macro lens, or a Tokina 12-24 ultra wide angle, which is nice if you can get close.