I’m not afraid of bugs or anything else. I just believe in keeping compost and mud in the compost pile, not indoors. Ground foam was invented for a reason.To each his own. The roots come in all different configurations, and most of the time the stem is larger than the root and grows like a tree; large on the stem, smaller on the roots, as above pictured. Depending on conditions, you can usually "train" roots to grow in certain ways. For instance if you wish a flat root system, plant the seed next to the pot wall and it will grow with one flat side. You may choose to do whatever you wish including rejecting natural materials. If you are afraid of natural materials and or to protect finer projections you can dip them in matte medium to preserve them. I have never had problems with bugs. Personally, there is not better material for a dirty road than some good old Maryland red clay...and once again...free. Smoochies
I'm not at all surprised, actually.Looks good, but not surprised they weren't interested in publishing an entire article on it... you explained your whole idea quite completely in one paragraph. Not really enough "meat" for a standalone article.