Actively growing plants need nitrogen. Blood meal is an age-old, natural source of readily available nitrogen that's as effective today as it was in our grandparents' Time. Blood meal is an excellent starter fertilizer for fruiting plants such as tomato, Eggplant, squash, & melons. Many Organic gardeners use blood meal to side dress heavy feeders such as corn, Spinach, broccoli, & leafy green vegetables. Burpee Blood meal 12-0-0 formulation is a concentrated source of nitrogen that also supports soil microorganisms that help keep soils & plants healthy. Omri listed for Organic gardening.