Coast of Maine Organic Products Liquid Squid is a highly concentrated liquid fertilizer used to feed indoor house and tropical plants. It can also be used to supplement greenhouse and hydroponic crops as well as annuals, roses, perennials, vegetables, fruit, shrubs and trees outside. Once diluted, it can be watered-in or applied as a foliar spray. It is made from longfin inshore squid using a unique enzymatic cold digestion process.