Wiggle Worm Soil Builder™ Pure Worm Castings Organic Fertilizer - 15lb - OMRI Listed®In Store Location: @Outside @Steel Rack Wiggle Worm Soil Builder Pure Worm Castings Organic Fertilizer 15lb OMRI Listed 100% Organic. Wiggle Worm Soil Builder controls all aspects of the worm's environment 24 hours a day, 7 days a week and 365 days a year which eliminates all variables that could affect pureness. This level of control produces a pure, consistent product that can be used as a soil amendment and as a fertilizer. The nutrients and