Defining Biostimulants
A biostimulant is a substance or microorganism that, when applied to plants or the rhizosphere, stimulates natural processes to enhance nutrient uptake, nutrient efficiency, tolerance to abiotic stress, and crop quality — independent of its nutrient content. This definition, broadly aligned with the European Union's 2019 Fertilising Products Regulation, distinguishes biostimulants from both fertilizers (which supply nutrients directly) and pesticides (which protect against biotic stress like pests and diseases).
How Biostimulants Differ from Fertilizers
The distinction matters, especially for organic farmers. While fertilizers provide raw nutrients (N-P-K), biostimulants work by making plants better at accessing and using the nutrients already available in the soil. Think of it this way: a fertilizer is like adding more food to the table, while a biostimulant is like improving the diner's ability to eat and digest.
| Feature | Fertilizer | Biostimulant | Pesticide |
|---|---|---|---|
| Primary function | Supply nutrients | Enhance natural processes | Protect against pests/disease |
| Mode of action | Direct nutrient delivery | Stimulates root growth, microbial activity, stress tolerance | Kills or repels organisms |
| Organic compatible | Some (organic-approved only) | Many (check certification) | Few (biological only) |
| Environmental risk | Runoff, leaching | Generally very low | Varies widely |
Types of Biostimulants
Biostimulants come in several categories, each with different active ingredients and mechanisms:
- Humic and fulvic acids: Derived from decomposed organic matter, these improve soil structure and nutrient availability.
- Seaweed extracts: Rich in cytokinins and other growth-promoting compounds, commonly used in horticulture.
- Protein hydrolysates: Amino acid-based products that support plant metabolism and stress recovery.
- Plant-derived extracts: Products like GrowMás that use proprietary blends of plant-based bioactive compounds to stimulate growth and resilience.
- Microbial inoculants: Beneficial bacteria and fungi (like mycorrhizae) that colonize roots and improve nutrient access.
Biostimulants and Organic Certification
Not all biostimulants are automatically approved for organic use. In Canada, products must be reviewed against the Permitted Substances Lists (CAN/CGSB-32.311) to be used in organic production. In the United States, products must comply with the USDA National Organic Program (NOP) standards.
GrowMás is one of the few biostimulants that holds dual compliance: it is approved for use under both the Canada Organic Regime (COR) and the USDA NOP, with Procert Registration #25-2244. It is also CFIA registered (Registration #2018114A), meaning it has been reviewed and approved by the Canadian Food Inspection Agency for sale and use in Canada.
The Growing Market
The global biostimulant market is projected to reach over $5 billion by 2028, driven by increasing demand for sustainable agriculture, tightening regulations on synthetic inputs, and growing evidence of biostimulant efficacy from field trials worldwide. For organic farmers, biostimulants represent one of the most promising tools for closing the yield gap between organic and conventional production.
Getting Started with Biostimulants
If you're new to biostimulants, the best approach is to start with a simple treated-vs-untreated comparison on a portion of your operation. This "grow a row" approach lets you see results firsthand before scaling up. GrowMás offers free samples through the Grow a Row Challenge to help growers get started.