Donegal Seaweed 100% Organic Concentrate Seaweed Extract Trace elements found in our Seahydra seaweed extract include magnesium, potassium, zinc, iron, and nitrogen all of which are beneficial to plants. Nitrogen, for instance, is essential to the production of nitrate, a key component needed by plants during photosynthesis Improved fields after seaweed treatments were measured in potatoes, sweet corn, peppers, tomatoes, apples, strawberries, okra, and oranges, grasslands Important Plant Hormones in SeaHydra Another major component in SeaHydra liquid seaweed fertilizers is the hormones. The main hormones in seaweed are auxins, cytokinins, betaines, and gibberellins. These hormones are essential to plant health. Most of these are only required in very small proportions but are important nonetheless.