Is there any easily-accessible science on where primocanes originate on black raspberry and other brambles?
Yes, the “crown” but what constitutes the crown? A couple of mine seem to have new primocanes originating at or slightly above ground-level–basically at what appears to be the very base of the floricane (the growth is way too vigorous and soft to be a low-growing fruiting floricane shoot). Is there some calculation where below a certain point the bud makes a primocane vs a floricane? Or did I just plant them too shallowly?
That helps. I actually have a bunch of wood chip mulch I’m planning to put over the raspberry bed.
I had straw down before, but I raked up the straw and I noticed the phenomenon I mentioned above. I imagine they’ll be fine once I put a couple inches of wood chips back down.
Yeah it should be fine. I have experienced a sudden death syndrome with black raspberries. The canes just giving it up. It happened with Niwot, Jewel, and Allen. Luckily I made some crosses and my hybrids are not experiencing this sudden death. At least not so far. A few years old now. Berries are actually better anyways.