In the Scottish Highlands, heather (Calluna vulgaris) sometimes forms strikingly regular patterns. Bands of vegetation alternate with bands of bare ground, with the whole pattern slowly moving perpendicular to the bands. I present a model where simple interactions between heather, wind, and soil are sufficient to generate periodic travelling waves similar to the real-life patterns. Heather and soil diffusion are essential components of the model, revealing how heather acts as an ecosystem engineer, extending its habitat into harsh, wind-blasted environments through pattern formation.