Today I refound a wild giant blackberry variety that I first ran across on our property when I was a kid (I only ever saw one or two little plants in one specific spot). We have the usual wild blackberry and black raspberry brambles, but this thing is very different. The small vines are string-like with small rounded leaves but the berries are three to four times the size of our blackberries, and the flavor is better. I tied flagging tape onto the plants, which are nearly hidden by weeds, and I'll transplant them this winter.
Any idea if this is a wild species or maybe an old commercial variety? As I said the vines are about as thick as garden twine and the leaves differ from the wild ones. Hopefully they will bulk up if removed from competeing weeds.
Is there any trick to starting from seed?