The present invention relates to compositions comprising the crystalline form B of 1,5-dimethyl-6-thioxo-3-(2,2,7-trifluoro-3-oxo-4-(prop-2-ynyl)-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-1,3,5-triazinane-2,4-dione, and at least one further active compound selected from herbicides B and safeners C and their use as herbicides, i.e. for controlling harmful plants, and also a method for controlling unwanted vegetation.
