I love your stacked pots Clint, what a fun way to grow plants.
The few semp varieties I have rotting problems with are because they don't like my 3 months of rain.
There are just a few that have this problem. The area they are in is very fast draining with a lot of sand an chicken grit.
I should probably put them in containers and place them under a roof during our rainy season. I have almost 400 varieties of sempervivum and Jovibarba, with only a very few that have this problem.
