The main concept consists of an upside down pyramid shaped Cell or Tube. The roots are forced down to one spot, where the air prunes them. Upside down shapes are the only shapes that correctly air prune. (Note the hole at the bottom must be a square).
Older more advanced Viro-Cells still have a great downward root growth. This is important for when a project gets delayed, which unfortunately happens more times than not. Viro-Cells and Viro-Tubes last twice as long as conventional cells and tubes.
