What is the best thornless blackberry in your opinions?
The ones bred by the University of Ark. program are great, EXCEPT they are very marginal in terms of cane hardiness in Zone 6. I lose the canes about 3 years out of 4. But, that 4th year, which is THIS year due to the exceptionally mild winter, will be great -- they look fantastic now, and I know I'm going to get a ton of nice berries.
I have tried Chester, and its a dog - very weak for me, planted right next to all of my other blackberries which thrive, so it's not the conditions, and it hasn't done anything to speak of in 3 years.
I have Navaho, Chester, and 2 other from Arkansas, and Triple Crown beats them all in my soil.
Mine are Apache and Arapaho and I could get cuttings from these six plants but I wanted to check to see if I might be smarter to not put all my eggs in the same basket. This is the second yr and the plants have covered a 6'x 15' cyclone fence. They are 20% bloomed and covered with buds so I guess I will see how they finish.
My Chester's are very productive, but they never really get sweet. My favorite is Triple Crown, followed by Doyle.
For me Doyle is the most productive (by far). The next is Triple Crown.
Triple crown, on average, has received the most positive comments on this forum over the past few years.