Abstract: The present invention describes a method for treating a biological material, said method comprising exposing the biological material to vacuum impregnation or pressure impregnation, preferably vacuum impregnation, in an aqueous impregnation solution comprising at least one surfactant.

Abstract: The present invention is directed to a cut flower with at least one leaf, wherein the silver content is at least 3.0 mg/kg dry substance in said at least one leaf, preferably at least 5.0 mg/kg dry substance in said at least one leaf, more preferably at least 7.0 mg/kg dry substance in said at least one leaf, more preferably at least 10.0 mg/kg dry substance in said at least one leaf, more preferably at least 15.0 mg/kg dry substance in said at least one leaf, more preferably at least 20.0 mg/kg dry substance in said at least one leaf, more preferably at least 25.0 mg/kg dry substance in said at least one leaf, most preferably at least 30.0 mg/kg dry substance in said at least one leaf.

Abstract: The present invention describes a method for treating a biological object being a cutting, root, sprout, budwood, root-stock, forest plant, fruit, vegetable, green leave, bulb, seed, or berry, said method comprising — arranging the biological object in an aqueous impregnation solution so that at least a portion of the biological object is immersed in the impregnation solution, but where at least another part of the biological object is kept free from aqueous impregnation solution; and — applying vacuum impregnation or pressure impregnation, preferably vacuum impregnation, to the aqueous impregnation solution when said at least portion of the biological object is immersed into the aqueous impregnation solution.