How useful is seaweed extract for the crops?
How Useful Is Seaweed Extract for Plants?
Certified GKH Gardening Expert
Seaweed is actually quite nutritious for plants. In addition to using seaweed extract, if you are near the coast at all (or know someone that is), you could also try harvesting some seaweed and composting it for your garden. Here is more information on that: https://www.gardeningknowhow.com/composting/ingredients/composting-seaweed.htm