‘Dartmoor’ is one of the most distinctive cultivars of B. davidii. It derives from a feral plant found in a ravine on Dartmoor, England, by a retired American gardener named Hayles, and introduced into horticulture in 1973. A very large and vigorous shrub, it can grow to a height and spread of 5 metres. The foliage is typical for the species, but the flowers are large and many-branched, unlike the usual single panicles of most forms. Flower colour is an unremarkable lilac-mauve. The inflorescences are so large and heavy they weigh down the ends of the branches, giving the mature plant an arching structure. Although a large, ungainly shrub, the impressive flowers are unparalleled in any other cultivar. It was awarded the RHS AGM in 1993, re-confirmed in 2010 (Stuart 2006; RHS Trials Office 2010) and remains widely available in the trade.