Cassia grandis aka Appleblossom Cassia

Cassia grandis is a tropical tree in the pea family, Fabaceae. Its common names include pink shower and appleblossom cassia. Its native range runs from central Mexico into tropical America. It grows on open slopes, wooded hillsides, and sparsely wooded plains. It also occurs near homes, roads, and pastures. Gardeners grow it in warm regions for shade and spring flowers.

In gardens, trees reach 40–60 feet [12.2–18.3 metres] tall. Their spread can reach 60 feet [18.3 metres]. Useful Tropical Plants gives a usual height of 66 feet [20 metres]. Wild trees can reach about 100 feet [30.5 metres]. The crown has a rounded or spreading shape. A straight trunk can reach 3.3 feet [1 metre] across. This semi-evergreen tree sheds some leaves during the year. Leaf loss may occur in the dry season or at flowering. Its pinnate leaves hold 8–20 pairs of small, oval to oblong leaflets.

Clusters of pink flowers open from mauve-pink buds in spring. Missouri Botanical Garden lists bloom time as March to April. The flowers have coral or salmon tones and do not last long. Insects pollinate them, and the tree provides value for bees. Large pods, shaped like beans, follow the flowers. Both the blooms and pods add interest to the garden. The pods contain seeds surrounded by sweet pulp with an unpleasant smell.

Grow this tree in full sun and soil that drains well. It tolerates light shade and needs moderate soil moisture. Established trees can cope with some drought. Choose a site sheltered from winds that dry the tree. Missouri Botanical Garden lists USDA zones 10–12, but also mentions zone 9b. Its frost guidance varies within the same profile. It warns against frost but notes brief tolerance down to 25°F [−3.9°C]. Seed propagation is possible; scarifying the hard seed coat may help germination.

Use it as a shade tree or a specimen in lawns. Leaf and pod litter have reduced its use along streets. It grows fast and can help restore woodland. People use its wood for building, tools, posts, and fuel. Seed gum has uses as a binder, including in medicines. Serious pest or disease problems are not reported. Mildew and leaf spot can occur. The fruit pulp is edible, but large amounts can cause purging. Sources list no known hazards, rather than proving safety for every use. Traditional remedies use fruit, seeds, and leaves as laxatives. Other reported uses include skin treatments and remedies for back pain.