Black Diamond blackberry variety

Rating [ 4 ]

Thornless commercial trailing cultivar with big fruit

Botanical designation

Rubus subgenus Rubus Watson 'Black Diamond'

Originated from a cross of

Originated from a cross of Kotata x NZ 8610L-163

Variety denomination

Variety denomination - 'Black Diamond', tested as NZ 9128R-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)

Begins to bloom in the

Begins to bloom in the third week of May

Harvest season starts in the

Harvest season starts in the first week of July

Productivity is

Productivity is 4.7 kg per plant

Soluble solids

Soluble solids - 10.4%


Acidity - 1.2%

Cold hardiness is

Cold hardiness is moderate

Heat tolerance is

Heat tolerance is low

Country of origin

Country of origin - United States

Current status

Current status - cultivated (actual)

Black Diamond blackberry is a thornless trailing cultivar from United States Department of Agriculture-Agricultural Research Service. It is one of three thornless varieties which are being released simultaneously - Black Diamond, Black Pearl and Nightfall.
Black Diamond is thornless, but primocanes are thorny on the basal 30 to 40 cm, fruiting laterals are medium in length. Harvest season starts in late June, peaks in early July and largerly done by the third week of July. Fruits of Black Diamond blackberry are uniform, conical, very attractive, have excellent firmness. This firmness leads to a high quiality machine-harvesting product and provides the opportunity for a good fresh market product if hand harvested. Also fruits have good flavor but are less aromatic than Marion blackberry. The average fruit weight for a season is about 6 g.
Winter hardiness is not high, about minus 13 C.
Table 1. Yield and berry weight comparison table for Black Diamond and other varieties (planted in 1999)
Cultivar Berry weight, g Yield, kg/ha
2001 2002 2003
Black Diamond 5.8 23281 15568 19001
Nightfall 6.2 42447 13405 20962
Silvan 6.2 31757 16811 21486
Marion 5.1 26380 13021 18397
Black Pearl 6.2 26969 14373 15505
Waldo 5.5 25849 11000 17286
Siskiyou 6.9 20969 9854 9359
Table 2. Harvest season duration and yield of Black Diamond and other varieties (planted in 2001 and 2002, harvested in 2003)
Cultivar Yield, kg/ha Harvest season
5% Peak 95%
Black Diamond 17281 July 11 July 21 August 6
Nightfall 14384 July 11 July 25 August 6
Silvan 12106 July 11 July 21 August 3
Marion 10382 July 11 July 21 August 6
Siskiyou 9656 July 11 July 21 July 31
Boysenberry 8670 July 16 July 25 July 31
Metolius 8480 July 11 July 21 July 25
Waldo 7112 July 21 July 31 August 6
Table 3. Averaged harvest season duration of Black Diamond and other varieties for several years (2001-2003 harvested)
Cultivar Harvest season
5% Peak 95%
Black Diamond June 28 July 8 July 21
Nightfall July 3 July 11 July 23
Silvan June 26 July 8 July 21
Marion July 3 July 10 July 22
Siskiyou June 25 July 8 July 25
Obsidian June 25 July 4 July 15
Black Pearl July 3 July 10 July 24
Metolius June 25 July 3 July 14
Waldo July 8 July 22 August 7

Diseases resistance

What diseases is blackberry Black Diamond resistant to?

Black Diamond has very good resistance to diseases such as Septoria Leaf and Cane Spot
Diseases susceptibility

What diseases is blackberry variety Black Diamond vulnerable to?

Black Diamond is quite prone to diseases such as Orange RustSpur Blight or Purple Blotch (Didymella Applanata)
Useful Growing Guides

Useful Growing Guides:

Black Cascade
Previous variety
Black Gem
Next variety

Reviews of the variety Black Diamond

Please login or register to write reviews!

Discussions about variety Black Diamond

No comments yet

Please login or register to post comments!