N-Dodecyloxymethylene-N-methylpiperidinium chloride (DMMP) and N-dodecyloxyme-thylene-N-methylmorpholinium chloride (DMMM) retarded germination of seeds of 9 cultivated plant species when applied at a concentration of 10-3 M. and inhibited germination at a concentration of 10-2 M. The exceptions were represented by Lepidium sativum L. and Linum usitatissimum L. https://www.mudrsat.com/product-category/maps/