I have read that there is such a thing as a thornless mariomberry. But I have called many nurseries and nobody seems to have them. Do you know where I can buy some?
Lane County Oregon
There are thornless blackberries. I could find only one nursery that claimed to have the thornless Marionberry, although there are cultivar with close to Marionberry flavor which are thronless. This is their website. I think these may be relatively new cultivars.