Abstract: A lawnmower mountable trimming device including a mounting bracket adapted for coupling with the deck of the lawnmower. An inner arm is provided that is pivotally attached to the mounting bracket and is extendible outwardly with respect to the mounting bracket. An outer arm is provided that is extendible outwardly with respect to the inner arm. A trimmer portion is coupled with the outer arm. The trimmer portion includes a protective shield extending horizontally beneath the outer arm. The trimmer portion includes a motor disposed below the protective shield. The motor includes a cutting line extending outwardly therefrom. A wound spring is disposed within the inner arm. The wound spring aids extension and retraction of the inner and outer arms with respect to the lawnmower to extend and retract the trimmer.