The Minnesota Bonsai Society has a very nice article (Potting Collected Rocky Mountain Juniper – Ryan Neil) on potting on a collected Rocky Mountain Juniper. This article is really great on understanding the basics on potting Junipers especially yamadori Junipers. I have posted this article on the following pages: Repotting/Potting, Collecting Trees for Bonsai and Junipers. The first two are under Bonsai Basics and the last under Conifers, shown under Bonsai Tree Information. The following photo is courtesy of Minnesota Bonsai Society.