It is a common canopy tree in lowland forests north of Auckland, often growing in association with kauri (Agathis australis), pōhutukawa (Metrosideros excelsa), tawapou (Pouteria costata), and pūriri (Vitex lucens) on basalt rocks and soils.
Bartlett's rātā grows to a height of up to thirty metres, usually beginning life as a hemi-epiphyte on taraire (Beilschmiedia tarairi), pūriri (Vitex lucens), rewarewa (Knightia excelsa) or tree ferns (Cyathea spp.).