not all gingers like to have their 'feet' wet, most actually prefer an evenly moist soil to dry. If your pseudostems are still green at ground level (where they are falling over) then they are not getting enough sun and the pseudostems are not strong enough to support themselves. Hedychiums tend to like morning sun and afternoon shade, here in Florida. In some other areas (depending on soil type, etc..) they will grow in full sun.
Liz

Thanks Liz. The stalks are green on the one that's flopping so perhaps I should move it to a spot with better sun. Do you know if that would best be done during winter?