Soil and Plant Additives

​​​​​Soil and plant additives are substances applied to seed, soil, or plants that claim to improve plant growth, crop yield or quality, or soil properties. To distribute soil and plant additives in Wisconsin, you must:

  • Have an annual soil and plant additive license, valid October 1-September 30. The license fee is $25/year.
  • Annually report tonnage and pay tonnage fees of $0.45/ton on products distributed in Wisconsin.
  • Obtain product permits for each brand name and formulation, valid until you change the label or formulation. Permits are $100/product, a o​ne-time charge.​
  • For products that also make plant nutrient claims, obtain a commercial fertilizer dealer license and if required a fertilizer permit​ for each product.​​

Current license holde​r​s will receive renewal packets by mail, along with including forms to report tonnage, in early August. Current license holders can also download renewal materials here. Updated forms will be posted by early August. New applicants can download application materials he​re.