The flowerheads of Albizia harveyi are white and fluffy; conspicuous hemispherical groups of stamens protruding from the flower cluster that forms the head.

The yet to open, yellow-green buds are rounded to cylindrical and hairy in stalked, compact clusters, a little like pale berries. The open flower stamens are straight, up to 2 cm long. Flowering happens in about the latter half of spring, blooming concurrent with foliage.

The fruit is a long, narrow pod, bulging at every seed and often curving along the margins; brown when ripe and dehiscent. The pod becomes 18 cm long and 2,5 cm wide, visible on the tree from end autumn to end winter. The seed is flattened and yellow-brown (Coates Palgrave, 2002; Schmidt, et al, 2002; Van Wyk and Van Wyk, 1997; iNaturalist).