The use of seaweed fertilizer is becoming more popular, but does it really work?
It is a very dilute, expensive fertilizer so it does provide plants with some nutrients, but the claims for it go well beyond that. Seaweed also contains a number of other substances called biostimulants which are claimed to help plants grow, ward off disease and produce higher crop yields. The biostimulants in seaweed fertilizer might be more valuable than the NPK nutrients.
Given the high cost of seaweed extract, it’s important to know if these biostimulants really work.
