Root Zone Starter Organic Fertilizer, 2-4-2, 4-Lb. BagRoot Zone Organic Starter Fertilizer 2 4 2 4lb Poly Bag. Root Zone(TM) fertilizer is formulated to feed all transplants, vegetable garden plants, both summer and winter plants, in containers or in native soil found in your yard. It is best used when planting seeds or transplanting anything into a new container or at home in the garden.