Hydroponic fertilizer
Hydro-Gro Leafy Fertilizer is intended for hydroponic growers seeking a complete and cost-effective fertilizer for their leaf crops. It is specifically formulated with all the nutrients needed for lettuce as well as kale, arugula and many herbs. Hydro-Gro can be used in conjunction with calcium nitrate to form a two-part fertilizer.
from CropKing, Inc.