What is the green stuff at the base of the head/roots of the Living Lettuce?
The green moss like substance is the actual foam substrate used when growing the Tanimura & Antle Living Lettuce. This foam substrate is used to hold each seed and seedling in place while growing. Once the seed sprouts into a seedling, it is then transplanted onto rafts and placed in the water pools. This is not meant to be eaten, but will not cause harm.