Black Pearl blackberry variety

Rating [ 4 ]

Thornless trailing blackberry cultivar from the Agricultural Research Service breeding program in Corvallis

Botanical designation

Rubus subgenus Rubus Watson 'Black Pearl'

Originated from a cross of

Originated from a cross of ORUS 1117-11 x ORUS 1122-1

Variety denomination

Variety denomination - 'Black Pearl', tested as ORUS 1380-1

Plants are

Plants are thornless

Bushes have

Bushes have trailing canes

Fruit weight is

Fruit weight is 6 g


Berries have a conical shape

Fruiting habit

Fruiting habit - floricane fruiting (summer-bearing)

Flowering on floricanes starts in the

Flowering on floricanes starts in the third week of May

Ripening date (regular) -

Ripening date (regular) - first week of July

Productivity is

Productivity is 18000 kg from ha

Soluble solids

Soluble solids - 13.42%


Acidity - 1.6%

Cold hardiness is

Cold hardiness is moderate

Heat tolerance is

Heat tolerance is moderate

Country of origin

Country of origin - United States

Current status

Current status - cultivated (actual)

Black Pearl (ORUS 1380-1) is a thornless trailing blackberry cultivar from the Department of Agriculture - Agricultural Research Service breeding program in Corvallis, released in cooperation with the Oregon State University Agricultural Experiment Station and the Washington State University Agricultural Research Center, United States. Black Pearl is adapted to machine harvesting and has yield and processed fruit quality very similar to world-known blackberry cultivar Marion. It is one of three thornless varieties which are being released simultaneously - Black Diamond, Black Pearl and Nightfall blackberry. These cultivars was intended to replace Marion variety, which hasn't good post-harvest characteristics. Black Pearl is thornless blackberry variety, but primocanes have some thorns on the basal. These thorns are soft and smooth. Also child canes from root are thorny. Black Pearl harvest begins at the few days of July, peaks in early July and is largerly done by the third week of July in south regions. Fruits of Black Pearl are similar in shape to Marion berries, they are a medium long conic and can have a blunt tip. Flavor is excellent. Fruit firmness is sufficient for machine harvesting and transportation. Yield is very similar to Marion, average berry weight is 6 g. Winter hardiness is about -13 C. Black Pearl blackberry has sufficient resistance to different diseases.
Table 1. Comparison table of Black Pearl, Nightfall, Silvan, Black Diamond, Marion, Waldo and Siskiyou blackberry cultivars at the North Willamette Research and Extension Centre, Oregon State University
Cultivar Fruit weight, g Yield, kg/ha
2001-2003 2001 2002 2003 Avg.
Black Pearl 6.2 26969 14373 15505 18949
Nightfall 6.2 42447 13405 20962 25604
Silvan 6.2 31757 16811 21845 23351
Black Diamond 5.8 29281 15568 19001 21283
Marion 5.1 26380 13021 18397 19266
Waldo 5.5 25849 11000 17286 18045
Siskiyou 6.9 20969 9854 9359 13394
Table 2. Harvest season date, yield and fruit weight
Cultivar Fruit weight, g Fruit yield, kg/ha 2003 Harvest season
5% 50% 95%
Black Pearl 6.1 15038 July 6 July 16 August 8
Waldo 4.8 23579 July 14 August 1 August 26
Marion 4.8 19896 July 9 July 14 July 28
Kotata 4.4 13323 July 6 July 18 July 28

Diseases resistance

What diseases is blackberry Black Pearl resistant to?

Black Pearl is resistant to most fungal diseases
Diseases susceptibility

What diseases is blackberry variety Black Pearl vulnerable to?

No susceptibility to spicific pests or diseases has been observed for Black Pearl
Useful Growing Guides

Useful Growing Guides:

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Reviews of the variety Black Pearl

Review from [STEWART WAINE]

Rubus Black Pearl, a thornless creeping type blackberry from America
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