The leaves are gray-green, saber-shaped and up to 3 in long. From spring to fall the plants bear purple flowers up to 6 in across that open only in the sun. Propagation: Easy from stem cuttings that can be placed in the ground where you want it to grow. The plant prefers light, sandy soils, requires well-drained soil and can grow in nutritionally poor soil. The plant prefers acid, neutral and basic (alkaline) soils and can grow in saline soil. It cannot grow in the shade. It requires dry or moist soil and can tolerate drought. The plant can tolerate maritime exposure.