A fenestration brickmould having an integral J-channel formed therein, along with a fastening and flashing flange extending therefrom, such that the brickmould may be attached to the perimeter of the fenestration assembly and may become an integral part thereof. Accordingly, the fenestration assembly, in combination with the brickmould of the present invention, preferably are attached to the frame of the building as a single unit. The J-channel is formed between the flange and the decoratively molded portion for receiving a variety of sidings, including, but not limited to, vinyl, cementious siding, and wood. The present invention eliminates the need for separate J-channel attachments when utilizing vinyl siding.