First of: Tree It is a great program! I have been dabbling in it for the last couple days.
I have, however, hit a roadblock: I was looking at the Bamboo plant example and at how the 9 different trunks are all around the center. I have been trying to recreate this - but seemingly could not find an option. All my trunks always spawn at the center. I am sure this is a simple option or panel I am missing, but after a couple hours of what I believe is every option changed I thought I'd reach out.