Biological preparation and method for inhibiting growth of foreign species of solidago canadensis L

The invention relates to a biological preparation and method for inhibiting growth of foreign species of solidago canadensis L., and belongs to the technical field of ecological prevention and controland biological agents for weed control. The invention provides the biological preparation and method for inhibiting growth of foreign species of solidago canadensis L. to avoid the harm and limitation of an existing inhibitor. The biological preparation contains an aqueous extract of green bristlegrass, and green bristlegrass adopted for the aqueous extract of green bristlegrass is the herbs of green bristlegrass. The method comprises the step of adopting the biological preparation containing the aqueous extract of green bristlegrass for watering an area in which solidago canadensis L. is grown, wherein green bristlegrass adopted for the aqueous extract of green bristlegrass is the herbs of green bristlegrass. The preparation is capable of inhibiting the absorption of nutrients by solidago canadensis L. and damag