In British English, a “bramble” is any rough (usually wild) tangled prickly shrub—specifically the blackberry bush (Rubus fruticosus)—or any hybrid of similar appearance, with thorny stems. Bramble or brambleberry may also refer to the blackberry fruit or products of its fruit (e.g., bramble jelly). The shrub grows abundantly in all parts of the British Isles and harvesting the fruits in late summer and autumn is often considered a favourite pastime. It can also become a nuisance in gardens, sending down its strong suckering roots amongst hedges and shrubs.
Elsewhere, such as in the United States, the term “bramble” also refers to other members of the Rubus genus, which may or may not have prickly stems—notably the raspberry (Rubus idaeus) or its hybrids. The word comes from Germanic bram-bezi.
Bramble bushes have a distinctive growth form. They send up long, arching canes that do not flower or set fruit until the second year of growth. Brambles usually have trifoliate or palmately-compound leaves.
Bramble fruits are aggregate fruits. Each small unit is called a drupelet. In some, such as the blackberry, the flower receptacle is elongated and part of the ripe fruit, making the blackberry an aggregate-accessory fruit.
Many species are grown and bred for their fruit. Ornamental species can be grown for flowers (e.g. Rubus trilobus), for their ornamental stems (e.g. Rubus cockburnianus) and some as ground cover (e.g. Rubus tricolor). Members of the Rubus genus tend to have a brittle, porous core and an oily residue along the stalk which makes them ideal to burn, even in damp climates. The thorny varieties are sometimes grown for game cover and occasionally for protection.
Most species are important for their conservation and wildlife value in their native range. The flowers attract nectar-feeding butterflies and hoverflies, and are a particular favourite of Volucella pellucens.
Brambles are important food plants for the larvae of several species of Lepidoptera—see list of Lepidoptera that feed on Rubus. The leaves of brambles are often used as a main food source for captive stick insects. Many birds, such as the common blackbird, and some mammals will feed on the nutritious fruits in autumn.