Cassia fistula is part of the Fabaceae family of plants. It is also known as Golden Shower, Purging Cassia, Indian Laburnum, or Pudding -Pipe Tree. Cassia fistula is native to Southeast Asia, particularly the Indian sub-continent. It is the national tree and flower of Thailand. It is a slow-growing deciduous tree. Cassia fistula can grow to 15m or 48ft.
Plant Cassia fistula in moderately fertile and well-drained soil as it is native to dry to moist tropics. It is actually somewhat drought-resistant. It likes the sun but will tolerate some shade.
Propagate Cassia fistula by seeds, since they have a hard coating soaking it overnight. It can also be propagated by semi-hardwood cuttings. Realize this is a slow-growing tree and it could take 10 years for it to flower grown from seed. The seeds live a long time and it produces a lot of seeds therefore, it is considered invasive in Australia.
The flowering can take as long as 3 months and it starts at the crown. Cassia fistula flowers are bright yellow and rather impressive, they are edible. They appear on terminal, drooping racemes about 30-60 cm or 12 to 24in long. The leaves, the fruit, and the seeds are mildly laxative and are used in traditional medicine. Cassia fistula fruit pulp is also used in modern medicine. The bark is used for dyeing and tanning.