A trimmer assembly for attachment onto the mower deck of a riding mower. The assembly comprises an L-shaped attachment and a height adjustment assembly. The L-shaped attachment is connected to the trim blade spindle of a riding mower, and comprises a pulley surface and a downwardly extending trim shaft holding surface. A series of pulleys within the L-shaped attachment are connected together by a trimmer drive belt that facilitates the movement of the trimmer shaft when the trim blade spindle rotates. The height adjustment comprises an upstanding shaft with a lever attached thereon. The lever is pivotally attached onto the top of the upstanding shaft, and comprises a foot actuatable handle, whereby the movement of the handle alters the height of the L-shaped attachment. The device further includes a pair of wheels that enable side-to-side movement, and a spring loaded mount that provides protection against damages from impacts.
