About Blackberry

The blackberries (singular, blackberry; genus Rubus, subgenus Eubatus; also called bramble or occasionally "bramble raspberry") are a widespread and well known group of several hundred species, a number of which are closely related apomictic microspecies, native throughout the temperate Northern Hemisphere.
They are perennial plants which typically bear biennial stems ("canes") from the perennial root system. In its first year, a new stem grows vigorously to its full length of 3-6 m, arching or trailing along the ground and bearing large palmately compound leaves with five or seven leaflets; it does not produce any flowers. In its second year, the stem does not grow longer, but the flower buds break to produce flowering laterals, which bear smaller leaves with three or five leaflets. First and second year shoots are usually spiny, usually with numerous short curved very sharp spines (spineless plants also occur). The flowers are produced in late spring and early summer on short racemes on the tips of the flowering laterals. Each flower is about 2-3 cm in diameter with five white or pale pink petals. The newly developed primocane fruiting blackberries flower and fruit on the new growth. The fruit, in botanical terminology, is not a berry, but an aggregate fruit of numerous drupelets ripening to a black or dark purple fruit, the "blackberry". Unmanaged mature plants form a tangle of dense arching stems, the branches rooting from the node tip when they reach the ground. They are very vigorous, growing at fast rates in woods, scrub, hillsides and hedgerows, covering large areas in a relatively short time. It will tolerate poor soil, and is an early colonist of wasteland and building sites.

The early flowers often form more drupelets than the later ones. This can be a symptom of exhausted reserves in the plant's roots, marginal pollinator populations, or infection with a virus such as Raspberry bushy dwarf virus (RBDV). Even a small change in conditions, such as a rainy day or a day too hot for bees to work after early morning, can reduce the number of bee visits to the flower, thus reducing the quality of the fruit. The drupelets only develop around ovules that are fertilized by the male gamete from a pollen grain.

Blackberry leaves are also a food for certain Lepidoptera caterpillars. See List of Lepidoptera that feed on Rubus"

Quotes about Blackberry

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