The present invention provides a composition containing crystal of flumioxazin, which is one selected from the group consisting of 1st crystal, 2nd crystal, 3rd crystal, 4th crystal, 5th crystal, 6th to crystal and 7th crystal, each of the crystals showing a powder X-Ray diffraction pattern which has diffraction peaks with 2θ values (°) shown in the corresponding right column of Table 1 set forth in the specification, and one or more herbicidal compounds selected from the group B-1, B-2, B-3, B-4, B-5, B-6, B-7, B-8, B-9, B-10, B-11 and B-12 as described in the specification. According to the present invention, a wide range of weeds can be controlled in a crop field, land under perennial crops, or non-crop land.