Phenoxymethane derivatives of the formula ##STR1## in which R.sup.1 represents hydrogen, alkyl, alkoxy, halogenoalkyl, halogenoalkoxy, halogen, alkoxycarbonyl, cycloalkoxycarbonyl or nitro,R.sup.2 represents hydrogen, alkyl or halogen,R.sup.3 represents hydrogen, alkyl, alkenyl, alkinyl, phenyl which is optionally substituted by alkyl and/or halogen, phenylalkyl which is optionally substituted by alkyl and/or halogen, alkoxy, phenoxy, halogenoalkyl, halogenoalkoxy, alkylthio, halogenoalkylthio, alkylsulphonyl, phenylthio, phenylsulphonyl, nitro or halogen,R.sup.4 represents hydrogen, alkyl, halogen, cycloalkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, cycloalkylaminocarbonyl, di-cycloalkylaminocarbonyl, phenoxycarbonyl which is optionally substituted by halogen and/or alkyl, cyano or the radical of the formula --COOR,whereinR represents hydrogen, an alkali metal cation, one equivalent of an alkaline earth metal cation, alkyl, alkenyl, alkoxyalkyl, alkylthioalkyl or the radical of the formula --CH.sub.2 --O--(CH.sub.2 --CH.sub.2 --O).sub.q --AlkwhereinAlk represents alkyl andq represents 0, 1 or 2,m represents 1, 2 or 3,n represents 0, 1 or 2 andp represents 1, 2 or 3,are particularly suitable for regulating plant growth.