Biostimulants in Colorado are not regulated under a separate “biostimulant” category; instead, they are regulated based on their claims and composition—most commonly as plant amendments or soil conditioners, unless they meet fertilizer nutrient definitions. The main reference legislation is Colorado Revised Statutes (C.R.S.) Title 35, Article 12 and the implementing rules in 8 CCR 1202-4.

Key statutory provisions cited for administration are the registration requirement under §35-12-104 and distribution (tonnage) fees under §35-12-106.

Implementing regulations (secondary legislation) is the Code of Colorado Regulations: 8 CCR 1202-4 – Fertilizers and Soil Conditioners rules (covers registration procedures, labeling requirements, and enforcement/inspection details).

Colorado requires mandatory product registration for products distributed in the state, including plant amendments (a category that typically includes most biostimulants).

Registration is handled by the Colorado Department of Agriculture (CDA), Division of Inspection & Consumer Services (ICS), Fertilizer Program. Legal basis for it is the C.R.S. §35-12-104 (registration requirement).

To apply for a Colorado product registration (including most biostimulants marketed as plant amendments/soil conditioners), you submit an online application through AgLicense with the product label and required product/company information (e.g., guaranteed analysis/composition). The Colorado Department of Agriculture (CDA), Fertilizer Program, reviews the submission administratively; once approved, the product is registered and must be renewed annually.

The core data and document package for the mandatory submissions comprise:

- Online application (product registration in the AgLicense system).

- Product label (copy/full artwork) (central required document).

- Registrant/company identity: name and address.

- Product identification: product name and classification/grade (as applicable).

- Product composition:

- Guaranteed analysis (nutrient content, where applicable).

- Sources of nutrients / active components (source description)

Conditional / “if requested” supporting data:

If CDA requests substantiation (especially for non-standard or biostimulant-type claims), you may need to provide proof of labeling statements and other claims demonstrating value and usefulness.

How the procedure works (step-by-step):

1. Create/access an AgLicense account.

2. Submit the application in AgLicense and upload the product label plus the required company/product/composition information.

3. Pay the registration fee (submitted as part of the application process).

4. CDA conducts an administrative review, focused on completeness and label compliance (not a scientific pre-market authorization).

5. Receive approval/registration (registration is product-based, not only company-based).

Ongoing obligations after approval

- Annual renewal is required.

- Tonnage reporting is required.

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