Both barberry and honeysuckle are introduced species. Apple and hawthorn trees line the field and hedge rows. South of the Merriland River are patches of white pine and poplar forests. Both are relatively young and contain herbs and grasses associated with old fields. A relatively mature oak-pine forest community is becoming established in several forest stands on the dry, sandy soil.
Red maple is also a major component of most of the oak-pine stands in moister areas.
Other tree species occur in the canopy and subcanopy but do not attain dominance. At most sites, heath shrubs dominate the understory vegetation with blueberries being most abundant. Mixed second growth forests also exist on the Reserve. The majority of the Reserve's lands are wetlands. In the red maple swamp, the red maple is the dominant tree with alder and winterberry holly being the dominant shrub species within the community.