It's not the look I want, but I will be building up the whole middle in a mound of rock and wood completely covered in plant mass. The wood is already in. I know bigger crypts would work but really want to use the Lucens if I can. They will be surrounded in rock at their bases. Do you think they will hold? Alterantely, do you know of anything that looks like Lucens but has a bigger root structure?
If you already doing that kind of building, so you're not gonna be out any more $$ on hardscape, I'd just go with the plant I wanted.