One thing that I've noticed about Heuffelii up here in the frozen tundra is that they tend to get shoved out of the ground with our freezing/thawing in spring. Sometimes that causes larger clumps to fall apart. That being said, they are still definitely worth it and I love em!
Here is a large clump of 'Mars'
Another one of my favorites is 'Orange Tip'
Lynn, haven't seen 'Clown' before. What a beauty!!