Hi Tim. Love this new thread.
I find that there are many forms of growth habit within the arachnoideum types. Some make beautiful mounds and seem to have no trouble with staying healthy, even in my very wet winters and spring. Some will even grow up and over walls/rocks. I love seeing them do that.
Other arachs seem happy to just keep spreading out like a carpet. Love this form also.
Then there are those that form a more lumpy, course mound. I'm not overly found of this form of growth, but it still has it charm. I think this type takes a little more work to keep the colony healthy.
I'll try to add some photos for examples.
