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. Includes: 1-pound fertilizer， 1-pound dolomite， 2 reversible mulch covers Keeps your Earthbox soil condusive to plant growth Includes instruction manual for stress-free use Fertilizer Made in USA Your security is our number one concern