This bill introduces a new section to RSA 433-A, specifically section 433-A:13, which defines key terms related to agricultural substances, including "plant regulator," "plant biostimulant," "nutritional chemical," and "vitamin hormone product." A "plant regulator" is defined as any substance that alters the growth or maturation of plants, excluding those intended as nutrients or certain biostimulants. The bill clarifies that "plant biostimulants" are substances that enhance a plant's natural processes, improving nutrient efficiency and stress tolerance, while "nutritional chemicals" are substances that improve nutrient availability. Additionally, "vitamin hormone products" are defined as mixtures of plant hormones and nutrients.

The bill mandates that the commissioner of the department of agriculture, markets, and foods must establish rules regarding the sale and use of these substances within 120 days of the bill's enactment. The effective date of the act is upon its passage. The bill does not include any deletions from current law but adds significant new definitions and regulatory responsibilities.