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Laundry detergents are mixtures of chemical compounds commonly used as cleaning agents for clothes and various objects. Their different degree of decomposition and transformation make wastewater to contain a variable proportion of such contaminants. There is a possibility of contamination of the soil, but also of plant crops with detergents, if these insufficiently treated waters are used in irrigation.The aim of this study is to evaluate the degree of phytotoxicity of lavender powder detergent on lettuce (Lactuca sativa L.). The effect of the detergent was highlighted through the germination of seeds and the growth of lettuce seedlings.The use of lettuce as a test plant is recommended by OECD 208 and is a species that can be easily handled in pilot conditions but also in the field. [ABSTRACT FROM AUTHOR]