OMRI Listed and Registered CDFA Organic Input Material. Our Big Bloom Liquid Plant Food is a carefully selected blend of fertilizers formulated to support multiple blooms and seed formations. This liquid plant food supplies nutrients that your plants can access immediately. Big Bloom contains bat guano and earthworm castings. Bat guano has been used for centuries as a fertilizer for all kinds of plants. Combined with earthworm castings they create a nutrient-rich mix that can help your plants thrive. Garden tip: Big Bloom is formulated for all fruiting and flowering plants, and it can be used during all stages of plant growth.