Horehound (now reclassified as Pseudodictamnus hirsutus) is a small, shrubby perennial that grows quickly to 60cm with large, soft, furry leaves. Tall spikes of small lilac flowers and bright green foliage create a very attractive effect in spring. Prune back after flowering to keep the plant more compact throughout the summer. In midsummer the large leaves are replaced by much smaller ones to reduce transpiration.

It is very adaptable to well-drained or rocky soils and can be found growing in partial or even full shade. However, it will also grow in full sun on very inhospitable slopes with little water. It is a drought tolerant plant and does not thrive in humid climates, once established it does not need additional water. It can be used as a ground cover, several plants grouped together will soon form a dense canopy, giving a soft, light green mattress effect on the poorest of soils.

Native to the western Mediterranean and North Africa, most abundant in Spain and Portugal.