What is "crystal 11-20-15"? I know what the expansion crystals are - I use Terra-Sorb some times.
That is how i keep tract as when /( Date) I put them into the crystal water beads or water beads
to keep tract of how long it takes for them to root . these are the beads that expand in water .
I have them on a Table Next to a west window & all containers sitting on Heat Mats & doing great