Wow, how time flies.
This is the fourth year of using 8 plants to a tray. The trays all contain the same clone so instead of root interference there is cooperation, each plant grows as if it had the tray all to itself.
Results are phenomenal compared to single pot/single plant, way phenonmenal. Four years now. Every two grows a clone mother in a two or a three gallon container is put to bud. The individual plant grows very well, and with all the clones taken it develops large symetrical buds, more than any individual in the trays.
But the yield is half again as much per square foot with the tray. That clone mother with a 24" canopy yields 6 oz, a four plant tray with a 24" canopy yields 9 oz. The same results can be had using very high labor intense grow methods, but multi plant trays achieve this with minimal effort.
11 Northern Lights are in the tray picture, neither stunted nor hemped.