Castanospermum australe – Black Bean Tree

Castanospermum australe, commonly known as Black Bean Tree or Moreton Bay Chestnut, stands out with glossy evergreen foliage, dense shade, and bold subtropical appeal. In spring and early summer, it produces striking orange to yellow flowers, followed by large decorative seed pods. With its vigorous growth, robust structure, and year-round presence, Black Bean Tree are ideal for larger gardens seeking dramatic shade and strong landscape character.

Black Bean Tree in NZ

Black Bean Tree grows best in full sun to partial shade, in fertile, well-drained soil, with regular moisture during establishment. In suitable New Zealand climates, it withstands wind if sheltered and suits parks, larger gardens, avenue planting, and spacious residential or commercial landscapes. Castanospermum australe (Black Bean Tree) is best planted where its dense canopy and eventual scale can be fully appreciated.

Castanospermum australe size, spacing, and growth rate

Black Bean Tree can reach around 6 to 8m tall and 4 to 6m wide within 10 years, with a moderate to fast growth rate in warm conditions. Allow generous spacing from buildings, paving, and services so the canopy can develop naturally. Plant Castanospermum australe where long-term shade is desirable, and avoid tight spaces where its mature spread may become restrictive.