Aloysia citrodora. Semi-deciduous, tender perennial shrub. Leaves have strong citrus fragrance and flavor. Pale lavender flowers. Good in borders or large containers. Can be overwintered as a houseplant. Grows 2-5' tall by 18" wide as a summer annual; can reach 10' in zones 8-12. Blooms in summer. Full sun. Plant in loamy, well-drained soil. Annual except in zones 8-10.