The present invention relates to a method, with the help of means, for treating plants or products derived therefrom, habitats, growing chambers, storage chambers, soil, stored parts of plants, oils, technical emulsions and other technical products in order to obtain protection against pests and/or to inhibit germination in plants. Means are used in the form of a plant species belonging to at least one or other of the families: Populus, Mentha, Ribes, Allium, Tagetes and Valeriana. The invention also relates to means for implementing the method.
