Happy FrogJump Start Fertilizer (3-4-3) is formulated for use on transplanted seedlings and re-potted container plants. This proprietary mix of fertilizers supplies phosphorus, a nutrient necessary for the early stages of plant growth. It also contains calcium which may help build stronger cell walls and boost the plants ability to resist disease. Mycorrhizal fungi are included to help increase root efficiency, which may enhance nutrient uptake and water absorption. OMRI Listedand Registered CDFA Organic Input Material.