Simpleleaf Chastetree purpurea is a striking deciduous shrub known for its aromatic, silver-grey foliage and long spikes of lavender-purple flowers that bloom in summer. Growing to about 2-3m in height, it’s perfect for adding a splash of colour to borders or as a feature plant. This drought-tolerant plant thrives in full sun and well-drained soil, making it a low-maintenance option for dry, sunny gardens.