The Mont-Saint-Bruno park is home to 574 plant species, 20% of the documented total in the province. Below of altitude, the park's forest is dominated by maple and bitternut hickory (). Between and , the forest is dominated by the sugar maple () together with the American tilia () or the red oak (). Also found in the park are the Canadian hemlock (), the American hophornbeam (), the yellow birch (), the moosewood () and the northern whitecedar ().