Commercial Horticulture - Fruits and Nuts
Prime-Jan® Primocane - Fruiting Blackberry
 Type
- Primocane-fruiting; thorny, erect.
Date of Release - 2004; plant patent #15,788.
Fruit Size - Floricane fruit average 5 g; primocane fruit vary by
location grown, from 3 to 15 g in various trials.
Flavor/Sweetness - Good, similar to other thorny varieties; soluble
solids (percent sugar) averages 9.6%.
Yield - Floricane yields comparable to floricane-fruting thorny
and thornless varieties such as Apache and Ouachita; usually exceeds Arapaho in
floricane yield. Primocane yields vary greatly by location, from very high in
the Willamette Valley of Oregon to very low at Hope, Arkansas.
Maturity Date - Floricane fruit ripens beginning approximately June 8
at Clarksville, Arkansas, and fruiting extends for about four weeks. Floricane
ripening season begins just after that of Arapaho. Primocane fruit begins
ripening approximately July 18 at Clarksville and Sept. 1 in Oregon. Primocane
fruiting can continue until frost depending on summer and fall temperatures.
Fruit development to maturity may not be completed in more northern areas of the
U.S.
Disease Resistance - Floricanes susceptible to double blossom/rosette,
but primocanes avoid this disease since the disease does not appear until the
second season on the canes. No orange rust observed and only slight anthracnose
observed.
Comments - Recommended only for home garden use and very limited
commercial trial. Not recommended for storage nor shipping. Hardiness similar to
Choctaw and Arapaho, but has shown some late winter cane injury in some years.
Summer temperatures above 85F can greatly reduce fruit set, size and quality on
primocanes; this results in substantial reductions in yield and quality of
fruits in areas with this temperature range in late summer and fall.
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