Fox Farm Lucky Dog K-9 Kube 3.8 CF (30 bags) FX14098 Growers Blend by the Pallet FoxFarm's Lucky Dog K-9 Kube is a light airy blend of peat moss and perlite. FoxFarm's K-9 Kube ultra-premium Growers Blend is filled with beneficial microbes that expand root development to optimize nutrient availablity to plants.