Siskiyou blackberry variety

Rating [ 3 ]

Very productive thorny trailing blackberry variety for processing and fresh market

Botanical designation

Rubus subgenus Rubus 'Siskiyou'

Originated from a cross of

Originated from a cross of ORUS 2027 x ORUS 1826

Variety denomination

Variety denomination - 'Siskiyou', tested as ORUS 830-4

Plants are

Plants are thornless

Bushes have

Bushes have trailing canes

Fruit weight is

Fruit weight is 7 g


Berries have a rounded shape

Fruiting habit

Fruiting habit - floricane fruiting (summer-bearing)

Flowering on floricanes starts in the

Flowering on floricanes starts in the fourth week of May

Harvesting begins in the

Harvesting begins in the first week of July

Productivity is

Productivity is 11000 kg from ha

Soluble solids

Soluble solids - 11.4%


Acidity - 1.5%

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 - obsolete or rarely used

The primary goal of the US Department of Agriculture–Agricultural Research Service breeding program, in cooperation with Oregon State University, was the development of blackberry cultivars that will complement or replace Marion blackberry. While Marion fruits are ideal for processing, the plants are thorny and trailing, susceptible to winter injury, and were too soft and tender skinned for the fresh market. Black Butte variety, released in 1996, has extremely large fruit, and is early ripening and firm enough for local fresh-market sales, but it was not suitable for processing.
Siskiyou (ORUS 830-4) is early, large-fruited, stress-tolerant, and is a dual purpose berry for the fresh and processed market. Generally, trailing blackberries, such as Marion, Olallie, Boysen and Waldo, are grown in mild climates where winter temperatures do not fall below minus 17 C and they usually have very poor fruit quality if the fruit ripen when daytime temperatures are higher than 32 C. Siskiyou was widely adapted by trailing blackberry standards.
The average fruit weight for a season is about 8 g. The fruit are cylindrical and blocky. Set of the drupelets at the tip of Siskiyou fruit is not consistent. The primary fruiting season of Siskiyou is similar to that of Black Butte, it ripens its first fruit at the beginning of July. The duration of harvest season is about 30 days. Siskiyou has excellent fresh flavor but is not as strongly aromatic as Marion. Siskiyou can be mechanically harvested.
Table 1. Yield and average berry weight of Siskiyou blackberry cultivar compared to some other varieties
Cultivar Yield, t/ha Berry weight, g
1995 1996 1997
Siskiyou 5.6 14.3 15.1 7.8
Black Butte 7.1 9.7 9.5 8.9
Kotata 13.0 16.8 12.9 5.0
Marion 5.9 15.0 21.2 5.0
Ranui 2.3 8.7 11.6 7.6
Waldo 7.9 20.3 24.1 6.0

Diseases resistance

What diseases is blackberry Siskiyou resistant to?

Siskiyou is resistant to most fungal diseases
Diseases susceptibility

What diseases is blackberry variety Siskiyou vulnerable to?

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

Useful Growing Guides:

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Reviews of the variety Siskiyou

Review from [FULLPLATE]

My berries are only half that size but it is first year for me everytime I bit into one I think boysenberry. I will give it some time maybe it will be better next year. My new berry I planted last year only has a few as well can’t wait to try them. My wild treasure tastes just like my wild blackberries. Yum. Thanks for the update.
Edit JT said small drupelats. Here is a pic of mine
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