Buddleja davidii 'Dartmoor' is arguably the most unusual B. davidii cultivar ever raised. Reputedly cloned from a plant found growing in a small ravine on Dartmoor near Yelverton by a retired American gardener by the name of Hayles, the shrub was introduced to commerce in 1973 and accorded the RHS Award of Garden Merit (record 678) in 1993 (reaffirmed 2010).