We are out of Blackberry plants at this time. Please check back in the summer.
Growing them in a pot? Sure, why not? Blackberries always fruit on the previous year’s stems, so just after you have harvested your crop, remove any stems that have fruited by cutting them at their base. Tie any new stems to supports; these should fruit the following year. Replace the top layer of potting mix every spring. The cuttings I am offering are rooted cuttings from my mother plant.
To harvest the sweetest berries we don’t pull them off the plant until they are ripe enough and want to be pulled off. You will know they are not ready to pick if you have to coax them off.