The term biostimulant is defined as a substance that is neither a plant nutrient nor a pesticide, but has a positive impact on plant health. A biostimulant is an organic material that, when applied in small quantities, enhances plant growth and development such that the response cannot be attributed to application of traditional plant nutrients.
Biostimulants have been shown to influence several metabolic processes such as respiration, photosynthesis, nucleaic acid synthesis and ion uptake.
Biostimulants are not fertilizers meant to correct a severe nutrient deficiency, but are mixtures of one or more things such as microorganisms, trace elements, enzymes, plant hormones, and seaweed extracts.
They may enhance nutrient availability, water-holding capacity, increase antioxidants, enhance metabolism and increase chlorophyll production