Rubus spp, Blackberry
Zone
  6/8a/3
Pollination
  self-fertile
Blooms
  hybrids predominately from the US may bloom extremely late.
Chill Hours
  200 - 900
pH
  5.5 to 6.5 (preferred), 4.5 to 7.5 (acceptable)
Yield
  1 year (clone)

There are many blackberry species native to Europe and North America, and newer cultivars are likely a combination of two or more of them.  Certain qualities may give us an idea of where they came from.  For example, disease resistance is probably derived from species from eastern United States, such as Rubus argutus and Rubus allegheniensis (R.  allegheniensis may also be responsible for erect canes), while the thornless quality may have come from Rubus ulmifolius, a species native to Europe and North Africa.  

Blackberries that aren't rated for Zone 5 or lower can still be grown there to some extent.   They die-back to the roots every winter but are still capable of producing a few dozen berries the same year.   Some late varieties may not grow back and flower quick enough to fully ripen the fruit before the end of the grow season.

Many blackberry varieties tend to be very acidic until they are completely ripe.




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Blackberry
Rubus spp

Apache

Ark 1007 x Navaho.  Developed in Arkansas, PP11865 (1999).
Zone
:
6
Ripens
🍏:
mid   :   2 to 3 weeks after Arapaho.   5 week harvest.
Chill
:
800 - 900

Yield
:
5 to 7 lb/plant
Afflictions
:
Resistant to orange rust and double blossom.   Somewhat resistant to anthracnose.
thornless / erect

Arapaho

Ark 631 x Ark 883.  Developed in Arkansas, PP8510 (1992).
Zone
:
6
Ripens
🍏:
early   :   3 to 4 week harvest
Chill
:
400-500

Texture
:
firm flesh
Afflictions
:
Resistant to orange rust and double blossom.   Somewhat resistant to anthracnose.
thornless / erect

Baby Cakes

APF-120T x APF-132T.  Developed in Arkansas, PP27032 (2015).
Zone
:
4? (7a)
Ripens
🍏:
early-mid   :   1 week after Arapaho

Tree Size
:
dwarf, grows up to 3-4 feet tall
Afflictions
:
Resistant to disease (nonspecific).
Baby Cakes is a thornless, dwarf blackberry with erect canes.

Balsors Hardy

Originated in Nova Scotia.
Zone
:
4b? (4a)

Black Satin

Originated in Illinois.
Zone
:
5b?
Afflictions
:
Resistant to anthracnose.
thornless / semi-erect

Caddo

Prime Ark 45 x Ark 2108T (Navaho x A-1507T).  Released in Arkansas (2018).
Zone
:
6b
Ripens
🍏:
early-mid   :   0 to 0.5 weeks after Arapaho
Chill
:
300?

Tree Size
:
8g/berry
Afflictions
:
Resistant to orange rust and anthracnose.
thornless / erect

Cherokee

Introduced in Arkansas around 1970 (non-patented).
Ripens
🍏:
early?   :   harvest season lasts for up to 3.5 weeks.
Afflictions
:
Resistant to anthracnose.  
Susceptible to double blossom.
erect

Chester

Zone
:
6a   :   may experience minor dieback in zone 6a
Ripens
🍏:
late
Afflictions
:
Resistant to orange rust, cane blight, and double blossom.  
Susceptible to phytophthora root rot.
thornless / semi-erect / ornamental lavender flowers

Chickasaw

Ark 842 x Ark 1246.  Developed in Arkansas, PP11861 (1999).
Zone
:
6
Ripens
🍏:
early-mid   :   0.5 to 1 week after Arapaho.   5 to 6 week harvest.
Chill
:
500

Texture
:
firm flesh
Tree Size
:
10.7g/berry, 7.0 to 7.5 lb/plant
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
erect

Columbia Giant

NZ 9629-1 x ORUS 1350-2.  Developed in Oregon, PP28369 (2015).
Zone
:
6b (6a)
Ripens
🍏:
  .......   :   3 week harvest

Texture
:
firm flesh
Fruit Size
:
14g/berry
Yield
:
15.1 lb/plant
thornless / trailing canes

Columbia Star

NZ 9629-1 x ORUS 1350-2 (Black Butte x ORUS 828-43).  Developed in Oregon, PP25532 (2013).
Zone
:
6b (6a)
Ripens
🍏:
  .......   :   3 week harvest

Texture
:
firm flesh
Tree Size
:
Fruit Size
:
8g/berry
Yield
:
15.4 lb/plant
thornless / trailing canes

Darrow

Originated in New York.
Zone
:
5 (4b)
Ripens
🍏:
late?
erect

Doyle's

unknown parentage.  Developed in Texas, PP4094 (1976).
Zone
:
5? (6)
Ripens
🍏:
mid?   :   5.5 to 8 week harvest
Afflictions
:
Resistant to anthracnose and orange rust?
thornless

Fort Kent King

Zone
:
3? (4)
Afflictions
:
Resistant to anthracnose?

Illini Hardy

Chester x NY 95.  Developed in Illinois, PP8333 (1991).
Zone
:
4b
Ripens
🍏:
late?

Seeds
:
large
Fruit Size
:
4.5g/berry
Yield
:
low productivity
Afflictions
:
Resistant to phytophthora root rot.  
Susceptible to anthracnose?
erect

Kiowa

Ark 791 x Ark 1058.  Originated in Arkansas, PP9861 (1995).
Zone
:
6b (7a)
Ripens
🍏:
early-mid   :   1 to 1.5 weeks after Arapaho.   6 week harvest.
Chill
:
200 - 300

Texture
:
firm flesh
Fruit Size
:
10g/berry
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
Kiowa (a thorny blackberry) is similar to many thornless blackberries in that it needs to be completely ripe before it's worth eating.

erect

Lochness

SCRI 74126RA8 x SCRI 75131D2.  Selected in Invergowrie, Scotland, PP6782 (1987).
Zone
:
6
Ripens
🍏:
late?

Fruit Size
:
6g/berry
Yield
:
9.9 lb/plant
thornless / semi-erect

Marion

Chehalem x Olallie.  Introduced in Oregon (1956). non-patented.
Alias
:
Marionberry
Zone
:
8a
Fruit Size
:
3.75g/berry
trailing canes

Natchez

Ark 2005 x Ark 1857.  Originated in Arkansas, PP20891 (2008).
Zone
:
6a
Ripens
🍏:
early   :   with Arapaho.  5 week harvest
Chill
:
300

Fruit Size
:
9.4g/berry
Yield
:
5 to 7 lb/plant
Afflictions
:
Resistant to orange rust and double blossom.   Somewhat resistant to anthracnose.
semi-erect to erect

Nelson

unknown parentage.  Discovered near Farmington, Maine around 1928.
Zone
:
4 (3)
Ripens
🍏:
late?   :   2 week harvest
Afflictions
:
Resistant to disease (nonspecific).

Newberry

ORUS 834-5 x ORUS 1045-14.  Selected in Oregon (1994), non-patented?
Zone
:
7a?
Fruit Size
:
6.9g/berry
trailing canes

Osage

A-1719 x A-2108.  Developed in Arkansas, PP26120 (2013).
Zone
:
6b (6a)
Ripens
🍏:
early-mid   :   0.5 to 1 week after Arapaho.   5 to 6 week harvest.
Chill
:
350 - 450

Texture
:
firm flesh
Fruit Size
:
6g/berry
Yield
:
6.5 lb/plant
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
thornless / erect

Ouachita

Navaho x Ark 1506.  Originated in Arkansas, PP17162 (2003).
Zone
:
6b
Ripens
🍏:
early-mid   :   1 to 1.5 weeks after Arapaho.   5 week harvest.
Chill
:
400 - 500

Texture
:
firm flesh
Fruit Size
:
6g/berry
Yield
:
5 to 7 lb/plant
Afflictions
:
Resistant to orange rust and double blossom.   Somewhat resistant to anthracnose.
thornless / erect

Prime Ark 45

APF-1 x Prime Jim.  Developed in Arkansas, PP22449 (2010).
Zone
:
6? (5b)
Ripens
🍏:
early-mid   :   0.5 to 1 week after Arapaho
Chill
:
300

Texture
:
firm flesh
Fruit Size
:
6 to 7g/berry
Yield
:
6 to 9 lb/plant (floricane), 0.5 to 2.6 lb/plant (primocane)
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
Prolonged exposure to temperatures around 90F or higher can reduce yield.

erect

Prime Ark Freedom

A-2301T x APF-49T.  Originated in Arkansas, PP26990 (2014).
Zone
:
6? (5b)
Ripens
🍏:
early   :   1 week earlier than Arapaho.   4 week harvest.

Fruit Size
:
7 to 11g/berry
Yield
:
3.1 lb/plant (floricane), 1.4 lb/plant (primocane)
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
thornless / erect

Prime Ark Traveler

A-2293T x APF-49T.  Developed in Arkansas, PP28598 (2015).
Zone
:
6?
Ripens
🍏:
early-mid   :   roughly 1 week after Prime Ark Freedom, with Arapaho.   5 to 6 week harvest.
Chill
:
300

Fruit Size
:
7.1g/berry
Yield
:
2.5 lb/plant (floricane), 1.5 lb/plant (primocane)
Afflictions
:
Resistant to orange rust.   Somewhat resistant to anthracnose.
Prolonged exposure to temperatures around 90F or higher can reduce yield.

thornless / erect

Prime Jim

Arapaho x Ark 830.  Originated in Arkansas, PP16989 (2004).
Zone
:
6
Ripens
🍏:
early-mid   :   a few days after Arapaho.   4 week harvest.
Chill
:
300 - 400

Fruit Size
:
4.9g/berry
Yield
:
5 to 7 lb/plant (floricane), 1 lb/plant (primocane)
Afflictions
:
Resistant to orange rust?
Somewhat susceptible to anthracnose.   Floricanes are susceptible to double blossom disease, but primocanes avoid infection.
erect

Rosborough

Developed in Texas, released in 1977.
Afflictions
:
Somewhat susceptible to double blossom.
Rosborough can tolerate full sun in the extreme heat of an arid climate.  While there are a few other cultivars that are often recommended for arid climates (Brazos, Brison, and Womack), Rosborough appears to be the most adapted.  Its may also be the most productive out of the other arid tolerant cultivars.  Slightly acidic but sweeter than Brazos?

erect

Siskiyou

ORUS 2027 (Olallie x ORUS 1367) x ORUS 1826 (ORUS 1122 x Boysen).  Selected in Oregon (1983), non-patented.
Zone
:
7?   :   hardier than Marion
Fruit Size
:
7.8g/berry
trailing canes

Sweetie Pie

Navaho x MSUS29 ((Humble x Brazos) x Navaho).  Selected in Mississippi (1996). unknown patent # (if it exists).
Zone
:
7? (6)
Ripens
🍏:
mid   :   roughly 2 weeks after Arapaho?
Afflictions
:
Resistant to double blossom.   Probably Resistant to other diseases as well.
Sweetie Pie was bred for more southern conditions than Arkansas, but other low chill, disease resistant varieties bred in the east should do fine down there as well.

thornless / trailing canes

Sylvan

Zone
:
3
trailing canes

Triple Crown

Originated in Maryland (non-patented).
Zone
:
6b (6a)   :   may experience minor to severe dieback in zone 6a
Ripens
🍏:
mid-late?   :   roughly 1 week earlier than Chester

Fruit Size
:
7.6g/berry
Afflictions
:
Resistant to orange rust, double blossom, and phytophthora root rot.
thornless / semi-erect

Willamette Thornless Marion

bud mutation of Marion.  Discovered in Oregon, PP28309 (2012).
Zone
:
8a
Ripens
🍏:
  .......   :   6 week harvest
Fruit Size
:
3.75g/berry
Nearly identical to Marion with the primary difference being that it is thornless.