Description for Cassia alata The Cassia has few distinguishing features can be observed with little trouble. It is slightly smaller, but has the same spreading crown, long drooping branches and numerous, feathery leaves, but the branches are rough. The flowers are similar but the sepals are smooth, green inside and deep-red underneath. Common name Flower colours Bloom time Height Difficulty Apple Blossom yellow Spring / Summer 20 to 30 feet Easy. Planting and care Cassia tree care requires very little, but that little is important. Once your seed has germinated and has about six leaves, its time to decide where your tree will be growing. Cassia trees need full sun to flower and produce the most colorful blossoms. Sunlight Soil Water Temperature Fertilizer Full Sun Acidic, Neutral, Well-drained soil Average Water Needs, Water regularly, do not overwater. Hardiness 35-40 degrees F. a generic N-P-K (nitrogen - phosphorus - potassium) Caring