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Rubus arcticus, the Arctic bramble [4] or Arctic raspberry, [5] [6] Nagoonberry, [7] or nectarberry [8] [9] is a species of slow-growing bramble belonging to the rose family, found in Arctic and alpine regions in the Northern Hemisphere. It has been used to create hybrid cultivated raspberries, the so-called nectar raspberries. [9]
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Tromsø, a coastal city in Norway at 70°N, is in zone 7, and even Longyearbyen, the northernmost true city in the world at 78°N, is still in zone 4. All these coastal locations have one thing in common, though, which are cool, damp summers, with temperatures rarely exceeding 20 °C (68 °F), or 15 °C (59 °F) in Longyearbyen.
Raspberries are vigorous and can be locally invasive. They propagate using basal shoots (also known as suckers), extended underground shoots that develop roots and individual plants. They can sucker new canes some distance from the main plant. For this reason, raspberries spread well, and can take over gardens if left unchecked.
Kansas City's January daily mean temperature is 26 °F (−3 °C) and St. Louis's is 29 °F (−2 °C). The coldest temperature ever recorded in Missouri was −40 °F (−40 °C), set at Warsaw on 13 February 1905.
Rubus parviflorus is a dense shrub up to 2.5 meters (8 feet) tall with canes no more than 1.5 centimeters (1 ⁄ 2 inch) in diameter, often growing in large clumps which spread through the plant's underground rhizome. Unlike many other members of the genus, it has no prickles.
Rubus occidentalis is a deciduous shrub growing to 2 to 3 metres (6.6 to 9.8 ft) tall. [6] The leaves are pinnate, with five leaflets on leaves, strong-growing stems in their first year, and three leaflets on leaves on flowering branchlets.
Rubus is a large and diverse genus of flowering plants in the rose family, Rosaceae, subfamily Rosoideae, commonly known as brambles. [3] [4] [5] Fruits of various species are known as raspberries, blackberries, dewberries, and bristleberries.