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The Flower Garden Banks are located approximately 190 kilometres offshore from Galveston and Freeport, Texas. Access is exclusively by liveaboard dive boats, with the crossing typically taking 10 to 14 hours overnight. Most operators depart from Freeport or Galveston on Friday evening and return Sunday evening, offering a full weekend of diving. There is no day-boat access due to the distance. Liveaboard trips run primarily from May through September when Gulf conditions are most favourable.

The annual mass coral spawning at Flower Garden Banks is one of the most spectacular underwater events in the Western Atlantic. Typically occurring seven to ten nights after the August full moon, massive star coral and brain coral colonies simultaneously release billions of egg and sperm bundles into the water column. The event transforms night dives into a surreal underwater snowstorm. Liveaboard operators schedule specific trips timed to the predicted spawning window, and these trips book out months in advance.

Flower Garden Banks are salt dome formations that rise from the Gulf floor at 120 metres to within 17 metres of the surface. Unlike most Caribbean reefs showing decline, Flower Garden Banks maintain over 50 percent live coral cover, among the highest in the Western Atlantic. The isolation and depth of surrounding water create a unique ecosystem where tropical reef species coexist with pelagic visitors including hammerhead sharks and manta rays. The reefs also host species found nowhere else in US waters and serve as critical spawning habitat for commercially important fish species.