The pre-measured essential ingredients are a crucial part to the success of EarthBox Container Gardening System. The fertilizer and dolomite are absorbed at just the right pace throughout your growing season. The mulch covers keep all the nutrients packed inside， keep weeds out， and much more. Allows you to re-use your EarthBox gardening system (not included) year after year Contains: 1 lb. of Fertilizer (Standard-NPK-8-3-5) and1 lb. of Organic Dolomite 2 reversible mulch covers Plastic Made in USA Your security is our number one concern