Sesbania Grandiflora - Australian Corkwood - Rare Tropical Tree Seeds (15) his fast-growing specimen thrives in full sun and is very frost sensitive. Known as Australian Corkwood, it is also referred to as Scarlet Wisteria or the Hummingbird Tree, for obvious reasons. It is a small tree native to Malaysia and Australia. Its flowers are eaten as vegetables used in cooking, as are its leaves and pods. All parts of the plant are also used medicinally. This is a gorgeous, unique specimen!