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Blackberry

life science Maturity 5-7 Next article →

Blackberries are edible fruits produced by many species within the genus Rubus. They belong to the Rosaceae family and include many hybrids. These plants are commercially important because they produce abundant annual volumes of fruit. However, some species can be problematic. For example, Rubus armeniacus, known as the Himalayan or Armenian blackberry, is considered a noxious weed. In the Pacific Northwest of Canada and the United States, it grows out of control in woodlands and parks.

Basket of wild blackberries
Basket of wild blackberries

Botanically, a blackberry is not a true berry. It is an aggregate fruit made of many small drupelets. Each drupelet develops around an ovule that was fertilized by a male gamete from a pollen grain. One way to distinguish a blackberry from a raspberry is by how it attaches to the stem. When you pick a raspberry, the torus, or receptacle, remains on the vine, leaving a hollow core. When you pick a blackberry, the torus stays with the fruit.

Blackberry flower (2)
Blackberry flower (2)

Blackberry plants are perennials that grow on biennial stems called canes. These stems follow a specific two-year cycle. In the first year, the plant produces a primocane. This new stem reaches a full length and grows large palmate compound leaves. However, the primocane does not produce any flowers or fruit.

PRubus primocanes and floricanes
PRubus primocanes and floricanes

In the second year, the cane becomes a floricane. This is a non-growing stem where lateral buds open to produce flowering laterals. Most canes produce short, curved, sharp thorns, though scientists have developed thornless cultivars.

2020 year. Herbarium. Blackberries. img-011
2020 year. Herbarium. Blackberries. img-011

The history of blackberry cultivation involves significant scientific work in hybridization. In 1880, James Harvey Logan developed the loganberry, a hybrid of blackberry and raspberry. While the first thornless varieties appeared in 1921, they often lacked good flavor. Modern improvements came from the US Department of Agriculture (USDA-ARS). Between the 1990s and the early 21st century, they developed thornless cultivars like Triple Crown and Black Diamond. These varieties allow for efficient machine-harvesting and produce larger, firmer fruit with better flavor.

Black Butte blackberry
Black Butte blackberry

There are several distinct types of blackberry plants based on how they grow. Trailing blackberries are very vigorous and require a trellis for support. They are common in the Pacific Northwest, New Zealand, and Chile. Semi-erect blackberries are also vigorous and need trellises, but they are often bred to be prickle-free. Erect blackberries are less vigorous and spread underground via root initials, much like raspberries. Some erect varieties, such as 'Prime-Jan' and 'Prime-Jim', are primocane fruiting. This means the canes flower in midsummer and fruit in late summer or fall.

Bee pollinating Blackberry
Bee pollinating Blackberry

Global agriculture relies heavily on specific blackberry cultivars. Mexico is a leading producer, providing nearly 97% of the fresh blackberry market imported into the United States in 2017. Much of this production uses the 'Tupy' cultivar, which was released in Brazil in the 1990s. In the United States, Oregon is the top commercial producer, having produced 110 million pounds in 2017. Because some regions lack the winter chilling needed for flower buds, farmers may use chemical defoliation or growth regulators to help the plants bloom.

Blackberries play a vital role in local ecosystems. The leaves serve as food for various caterpillars and grazing mammals like deer. When the berries are ripe, they are eaten by birds and mammals, including the red fox, American black bear, and Eurasian badger. As these animals eat the fruit, they disperse the seeds to new locations. However, growers must watch for pests like the spotted-wing drosophila. This insect lays eggs under the soft skin of fresh fruit, where the larvae grow and destroy the crop.

Basket of wild blackberries
Basket of wild blackberries
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🖼️ Images & Media (6)
File:PRubus primocanes and floricanes.jpg
PRubus primocanes and floricanes.jpg
File:2020 year. Herbarium. Blackberries. img-011.jpg
2020 year. Herbarium. Blackberries. img-011.jpg
File:Bee pollinating Blackberry.jpg
Bee pollinating Blackberry.jpg
File:Basket of wild blackberries.JPG
Basket of wild blackberries.JPG
File:Black Butte blackberry.jpg
Black Butte blackberry.jpg
File:Blackberry flower (2).jpg
Blackberry flower (2).jpg
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