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NPK: 6-6-5 + 5% Ca. BioFlora Dry Crumbles® are designed for both pre-planting and continued fertilization throughout the growing season. These products are manufactured from high-quality, organic materials including bone meal, seaweed meal, organic acids and composted poultry manure. BioFlora Dry Crumbles® will enhance new growth and improve your soil's indigenous microbial populations.? One 50-pound bag should be enough for a dozen trees for one year if you are feeding the trees following the Urban Farm Tree Care Program. Store in sealed bucket or a metal trash can to reduce lure to pests.