The Umbrella Thorn Tree is a species of acacia that is native to India and Sri Lanka. It has a short, crooked trunk and a broad, umbrella-shaped canopy. The twigs have long spines. Leaves are medium green and twice compound. Flowers are white and are in rounded clusters. Hardy in zones 9-12. Growing Instructions for the Umbrella Thorn Tree The seeds have a hard seed coat that has to be treated, or scarified, in order for water to enter the seeds so that they can sprout. 1. Scarify the seeds by nicking or sanding the seed coat. The seeds can be sanded with sandpaper, a nail file or an emery board. 2. Soak the seed in water for several hours. 3. The seeds like moist, well-drained soil. Prepare a mixture of half potting soil and half sand, perlite or vermiculite. Put the soil in a pot. Water the mixture so that it is moist but not wet. 4. Put the seeds on the soil. 5. Cover the seeds with a thin layer of soil. 6. Water the seeds. 7. Place the pots in an area with warm temperatures in full sun or part shade. 8. When the seedlings are a few inches tall, they can be transplanted.