The Queens Gardens planting is organised on both an ecological and generic system. On the perimeter are straight avenues of tropical rainforest trees planted in 1887. Dominating the eastern boundary is an avenue of black bean (Castanospermum australe), some of which are original plantings. Along the southern boundary in the precinct known as the rainforest walk are a variety of botanical, historical and visually significant trees such as the mahogany tree from the West Indies (Swietenia mahagoni), the large banyan (Ficus retusa); the rain tree (Samanea saman); and the native carbeen (Eucalyptus tessellaris). The rainforest walk contains about 166 species of trees, shrubs and groundcovers, representative of the dry rainforest environments of North Queensland.