Jerry - So far it has been true 'trial and error' in getting the plants right for wet Florida weather. I spent a lot of time looking for plants that can handle rain better than most, they are cactus so that can be a daunting task, but there are some plants you just learn to avoid putting into beds here. I think the most important trick is building the bed with the best drainage possible, and in an area with enough sunlight to dry them off quickly when they do get wet. My beds are slightly sloped so they drain out to the grass, or into the 'dry' creek bed in the front garden, and I dug out a lot of dirt and replaced it with a "cactus mix". Opuntias seem to be nearly fool proof here, and Agave is pretty forgiving, so they are good for Florida beds and really make the beds look "exotic" in comparison to more typical Florida landscaping. I've also branched out into Yucca and other spiney companion plants like Dyckia, along with Euphorbia and others that look desert-like but can handle the wet.
In the front beds it looks as if I may have some problems with a couple of columnars, so I won't use those again, but the others seem to be hanging in there.
Bottom line is that if I have any cactus or succulents that could turn to mush in the rain I keep them in my covered shade house so I can control the moisture. Sometimes even that does not work, but I keep trying anyway!
It’s not the fall that kills you; it’s the sudden stop at the end.
Douglas Adams (1952 - 2001)