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 to 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.
How to grow Cassia fistula:
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. The seeds have a hard coating, soak them overnight. Or propagate by semi-hardwood cuttings. Realize this is a slow-growing tree. If you grow it from seed, it could take 10 years for it to flower. The seeds live a long time. Cassia fistula 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. The flowers grow on terminal, drooping racemes. The racemes are 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.