Seaweed & Kelp

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Seaweed & Kelp Plant Supplements Seaweed and kelp supplements provide naturally occurring plant growth compounds - cytokinins, auxins, alginates, and trace minerals extracted from marine macroalgae - that support root development, stress recovery, and overall plant vigor. Unlike synthetic nutrient formulas that deliver defined NPK ratios, kelp and seaweed extracts contribute a broad spectrum of low-concentration biologically active compounds that support the plant's own hormonal systems rather than substituting for them. They are most effective as supporting inputs within a complete nutrient program rather than as primary nutrition sources. Liquid vs. Dry Kelp Formats Liquid seaweed extracts (Maxicrop Original, Age Old Kelp, NPK Industries RAW Liquid Kelp) are water-soluble concentrates used as root drenches, reservoir additions, and foliar sprays. They mix readily into nutrient solution and deliver active compounds quickly to the root zone or leaf surface. Dry kelp meal (Maxicrop Kelpmeal, Down To Earth Kelp Meal, NPK Industries RAW Dry Kelp) is a soil amendment that releases nutrients slowly through microbial breakdown, making it more appropriate for soil programs and organic composting than hydroponic systems. Both formats contain similar kelp-derived compounds; format selection depends on your growing method and application timing. Applications and Timing Kelp extract is most commonly applied at transplant, during the vegetative-to-flowering transition, and as a stress recovery treatment after heat events, transplant shock, or pest pressure. Cytokinins in kelp promote cell division and lateral shoot development; auxins support root initiation. Foliar application during early flowering has been shown to support flower site development in some crops. Browse all nutrients or explore mineral supplements . Fast shipping. Related Guides & Resources Learning Center Nutrients & pH in Hydroponics Kelp Meal for Plants How to Mix Plant Nutrients Shop by Categor