Plant Profile: Rubus allegheniensis

The Allegheny Blackberry is a native shrub characterized by multiple stems and belongs to the rose family. Its red-purple stems begin upright but tend to arch as they mature, featuring prickles along their length.

Habitat: Found in forests, woodlands, and grassy balds.

The genus Rubus encompasses blackberries, dewberries, and raspberries, with most species exhibiting thorny or bristly stems and compound leaves. Notably, flowers and fruits typically develop on the previous year's canes rather than on new growth, necessitating careful pruning to avoid removing canes that will produce berries in the following season. There are variations among species; some grow as erect or arching shrubs reaching heights of up to 8 feet, while others spread along the ground like vines. Dewberries, for instance, bear fruit in the spring, whereas blackberries and raspberries yield their harvest in the summer. Overall, the Rubus genus includes some of the most vital plants for wildlife in the southeastern United States.

Rubus alleghaniensis, commonly known as the blackberry, flowers in late spring or early summer and bears fruit during the summer months. This woody shrub features canes that start upright but often bend down to take root in the soil. In their first year, these canes grow actively and produce leaves, while in the second year, they develop drupes before dying off. The canes typically reach heights of 3 to 6 feet, with new growth appearing green at the tips. Mature canes are brown or reddish-brown and are adorned with stout, straight or slightly curved prickles. The root system consists of a taproot, and the plant often forms loose colonies through vegetative means. It thrives easily and rapidly from transplants or cuttings when planted in areas with full sun to light shade and rich, fertile soil, although it can also adapt to clay-loam or rocky soils. The Allegheny Blackberry is prevalent in the mountains of North Carolina and is identifiable by the gland-tipped hairs that cover its branches.

The nectar and pollen from its spring flowers attract a variety of insects, particularly long-tongued and short-tongued bees, as well as butterflies. This plant offers excellent year-round cover, and its fruits are favored by songbirds, small mammals, foxes, raccoons, and black bears. In winter, birds and small mammals consume the seeds left behind from decaying fruit. White-tailed deer and rabbits may browse on the leaves, although the plant shows moderate resistance to deer damage.

Diseases, Insects, and Other Plant Issues:

While the Allegheny Blackberry is not known to suffer from specific insect or disease problems, it can become invasive and challenging to control. Due to its vigorous growth and ability to spread, caution is advised when choosing a planting location. In some cases, herbicides may be necessary for complete eradication.