This is a so-called highbush blueberry. 'Duke' is a fruit-bearing shrub of the American blueberry species, known for its very vigorous growth and early, abundant fruiting. It starts fruiting about 10 days before the 'Bluecrop' variety. The fruits vary in size – the first are very large, the later ones medium-sized. Thanks to their firmness, they store and transport very well. The shoots are stiff and upright, with very strong growth. 'Duke' is comparable to the 'Bluecrop' variety. Recommended for fresh consumption, freezing, and processing.

Frost resistance down to -28 °C. After a few hours of chilling, the berries become more aromatic. Self-fertile variety, does not require pollinators.

Size: very vigorous growth, stiff shoots; shrubs grow up to 130–180 cm in height.

Flowering and fruiting: blooms late, after spring frosts; flowers are white or pink. Very productive variety, fruits ripen from early August. The first fruits are large, round, light blue with a nice lasting bloom and firm skin, aromatic, sweet-wine flavor, in loose clusters, with a small stem scar. The leaves are fairly large, elliptical, leathery, dark green, strongly veined and glossy.

Care: prefers a sunny position sheltered from the wind. Soil should be permeable, light, fertile with a pH of 3.5–4, slightly moist. Mulching around the shrub with sawdust or conifer bark is beneficial.