Nice!
How are you keeping them moist enough? Is there water flowing past the soil over the shelves?
I am currently submersing the balls to see what will happen. I must say so far so good. The ADA balls from what I have seen can be submersed.Great project!! I was wondering if you could post a picture of the "ball" of substrate so that I (& we) may better understand how it is done? Also, I'm guessing the ball cannot be submersed, as can the ADA ones?
Thank You