They do like water...the first butterfly ginger I ever saw was while driving down the coast of Brasil, south of Rio, they were growing in roadside ditches full of water. My patch is large enough so there are sections that get less water, so I'll keep an eye on those areas and see if this problem occurs more frequently there. And I have a moisture meter with a long stem so I can reach in and check right next to any plant that's afflicted.
