Rubus spp, Blackberry
Zone
6/3
Blooms
(overall) hybrids predominately from the US may bloom extremely late.
Chill Hours
200 - 500+
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.

I am currently under the impression that many of these new disease resistant cultivars require a hot summer climate to ripen properly, otherwise they'll remain extremely acidic. This, along with their place of development (typically Arkansas and Texas), implies that their genes are predominately from species native to the south. If you live in a cool summer climate, you may want to aim for cultivars discovered or developed in the north.




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Blackberry
Rubus spp

Apache

buy
Developed in Arkansas.
Zone
:
5? (6)
Ripens
:
early-mid -- roughly 2 weeks after Arapaho. harvest season can last up to 6 weeks.
Chill Hours
:
800-900
Afflictions
:
Resistant to anthracnose, orange rust, and double blossom.

thornless, erect

Arapaho

buy
Developed in Arkansas.
Zone
:
6
Ripens
:
very early to early? (it is one of the earliest) -- harvest season can last for up to 4 weeks.
Chill Hours
:
400-500
Afflictions
:
Resistant to anthracnose, orange rust, and double blossom.

thornless, erect

Baby Cakes

buy
Zone
:
4? (5)
Size
:
grows up to 3-4 feet tall.
Afflictions
:
disease resistant

thornless, dwarf. says it doesn't need a trellis so the canes are probably not trailing.

Balsors Hardy

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

Black Satin

buy
Zone
:
5b
Afflictions
:
disease resistant

thornless, semi-erect

Cherokee

buy
Ripens
:
early? harvest season lasts up to 3.5 weeks.
Afflictions
:
Resistant to anthracnose.

Chester

buy
Zone
:
5b
Ripens
:
late
Afflictions
:
Resistant to cane blight.

lavender flowers, thornless, semi-erect

Chickasaw

buy
Developed in Arkansas.
Zone
:
5b? (6)
Ripens
:
early? harvest season can last for up to 6 weeks.
Chill Hours
:
500
Afflictions
:
Resistant to anthracnose and orange rust.

erect

Darrow

buy
Originated in New York.
Zone
:
5

Doyle's

buy
Zone
:
3? (5b)
Afflictions
:
Resistant to anthracnose?

thornless

Fort Kent King

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

Hull

buy
Released in 1981.
Zone
:
6
Ripens
:
mid-late or late?

thornless, semi-erect

Illini Hardy

buy
Zone
:
4b
Afflictions
:
Resistant to phytophthora root rot. Susceptible to anthracnose?

erect, large seeds. inferior flavor to wild, cold hardy blackberries.

Kiowa

buy
Introduced in Arkansas 1996.
Zone
:
6
Ripens
:
harvest season last for up to 6 weeks.
Chill Hours
:
200-300
Size
:
11g/berry

erect

Lochness

buy
Selected in Scotland.
Zone
:
5
Ripens
:
late

thornless, semi-erect

Nelson

buy
Discovered near Farmington, Maine around 1928.
Zone
:
4b? (3)
Ripens
:
mid-late to late?
Afflictions
:
disease resistant

Ouachita

buy
Originated in Arkansas.
Zone
:
6
Ripens
:
early -- roughly 1 week after Arapaho.
Chill Hours
:
400-500
Size
:
6g/berry
Afflictions
:
Resistant to anthracnose, orange rust, and double blossom.

thornless, erect,

Prime Ark 45

buy
Developed in Arkansas 2008.
Zone
:
6? (4)
Ripens
:
early
Size
:
6g/berry in hot climates, larger in more moderate climates.
Afflictions
:
Prolonged exposure to temperatures around 90F or higher can reduce yield.

primocane-bearing, erect

Prime Ark Freedom

buy
Originated in Arkansas.
Zone
:
6? (5)
Ripens
:
very early -- probably around 0.5 weeks earlier than Arapaho but not yet confirmed.
Size
:
6 to 10g/berry

primocane-bearing, thornless, erect

Prime Ark Traveler

buy
Developed in Arkansas 2008.
Zone
:
6? (5)
Ripens
:
early
Chill Hours
:
300?
Size
:
7.5g/berry
Afflictions
:
Resistant to anthracnose. Prolonged exposure to temperatures around 90F or higher can reduce yield.

primocane-bearing, thornless, erect.

Prime Jim

buy
Zone
:
6
Chill Hours
:
300-400
Afflictions
:
Possibly resistant to orange rust. Somewhat susceptible to anthracnose. Floricanes are susceptible to double blossom disease, but primocanes avoid infection.

primocane-bearing, erect.

Rosborough

buy
Developed in Texas, released in 1977.

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.

Sylvan

buy
Zone
:
3

trailing canes

Triple Crown

buy
Zone
:
5b? (6a)
Ripens
:
mid?

thornless, semi-erect