Chemboys - Liquid Kelp (Kelp extract) 55 GallonChemboys Kelp Liquid 0 0 5 is a natural plant food that provides a range of benefits for plant health and growth. Chemboys Liquid Seaweed Fertilizer is a complete seaweed extract fertilizer for plants. Our liquid seaweed will help stimulate natural root growth and helps to increase the bloom set and size of flowers and fruit. It increases and stabilizes chlorophyll in plants, which results in darker green leaves and increased sugar content in plants.