 In the Central Coast and Central Tablelands regions of New South Wales it grows in rainforest with such species as yellow sassafras ("Doryphora sassafras") and coachwood ("Ceratopetalum apetalum"), in wet sclerophyll forest with cedar wattle ("Acacia elata"), brown barrel ("Eucalyptus fastigata"), and in dry sclerophyll forest with such species as forest red gum ("Eucalyptus tereticornis") and river oak ("Casuarina cunninghamiana").Structurally, the flower of "P. lasianthos" is thought to be designed to attract insects as it has a white to mauve corolla, shallow and wide floral tube, and a large abaxial lobe.However, pollinators of mint bushes in general are poorly known.