An adjustable baffle assembly that can be moveably coupled to a front flow control baffle of a lawnmower cutting deck. The adjustable baffle assembly includes a first wall that is securable to the front flow control baffle in at least a first position and a second position. In some embodiments, the adjustable baffle also includes at least one flange that extends generally rearwardly from a bottom edge of the first wall into a generally triangularly shaped space defined between adjacent cutting circles.