Down here in southern middle TN z7b…
I have grown 1 hybrid and 1 blackberry… Loganberry (hybrid) and Obsidian (blackberry).
They both produce some long canes… Obsidian had some thorns but not nearly enough to really protect from deer or to keep birds from getting your berries.
My Logan from OGW was thornless. I had it planted on the east side of my home with a trellis right up against a brick wall. It was so close to the house that deer never bothered it… and very few birds did either.
Both were very popular targets for our southern red neck cane borer.
I planted Obsidian 2 crowns in the fall… the next year they filled my trellis with some nice looking pcanes… the next spring… i found that out of 6 nice long canes… 4 had huge swells in the cane just about the mulch level. RNCB… ruined them. 1 other had a smaller swell… and I tried leaving it in place… it initally leafed out and bloomes some… but bedore setting fruit… it shrivvled and died.
1 cane survived and produced fruit… nice large very good berries… but with whimpy thorns… many got pecked badly by birds.
What I did get to ripen well tasted very good.
Obsidian are similar to logans in that you have to let them turn ripe color… but then hang for a few more days to reach peak ripe.
With few thorns this makes them verry succeptable to bird munching, pecking, etc.
After that one cane fruited… the 2 crowns sent up a few very weak pcanes… 2-3 ft tall and skimpy.
I had seen enough… and yanked them.
I still have my Logan… it is verry succeptable to RNCB… and is only cold hardy (trellised canes) to around 4-5 F.
We had a 3F one winter a few years back and 50 ft or more of Logan canes that were trellised… died.
I have lost all or most Logan canes 3 times to RNCB and once to 3F cold.
They are still going though. No canes survived RNCB last year… all died… but this year my 2 crowns have produced 40 ft or more of pcane and so far no sign of RNCB.
Looks like I might get a good crop of Logans next year… IF the canes dont die of cold this winter.
They have survived 8F and 11F in the past with no die back.
But 2-3F will very likely kill any canes on a trellis over winter.
Steve sent me a Columbia Giant this spring… great roots… it grew very well initially… but it is thornless… and i planted it in a new bed out in my orchard (which is not protected from deer).
I has 3-4 thornless caddo out there too.
Every time they would grow a few leaves… my deer mowed them down. Columbia Giant and Caddo… and any thornless blackberry… are just not going to make it here without deer protection.
I had 2 Kiowa in the same bed and they did well… deer nipped them some mostly just the tips. They did produce enough pcanes this year that I am keeping them.
Hope this helps.
TNHunter