Liquid seaweed fertilizer is simply what its name suggests: a fertilizer that has been derived from natural seaweed sources. Seaweed is collected, some of the saltwater rinsed away and then allowed to decompose or ferment in water until the plant material is broken down into a liquid or slurry. Seaweed products are different than traditional fertilizers in a couple of critical ways. First off, their production methods have environmental benefits over conventional fertilizers. Secondly, while they contain nutrients, although it may be in lesser amounts, they also garner many benefits that aren’t seen with the application of conventional fertilizers.