Scott Berta of Tree Protection Supply (southeastern marketing partner for Tubex Tree Tubes) has several excellent instructional videos about Tree Tubes posted on youtube:
The ease & importance of applying herbicides around trees in tree tubes
The importance of pruning seedlings to a single stem before applying tree tubes
Direct seeding acorns, chestnuts and walnuts in tree tubes
If you have any questions about how to use tree tubes to achieve your planting goals, please don't hesitate to contact Scott Berta or Chris Siems to learn more.