 Hybridisation with Banksia conferta subsp. penicillata at the site of an old abandoned railway between Newnes and Clarence in the Blue Mountains has been recorded; a single B. marginata plant was surrounded by plants with intermediate features but more strongly resembling B. conferta subsp. penicillata. B. marginata can also interbreed with B. paludosa where they are found together. A hybrid with B. saxicola was recorded from Mount William during the Banksia Atlas project.
