Really, any variety of blackberries can be grown in a pot, but thornless varieties are especially suited for small spaces and patios. A 30 gallon root pouch can hold as many roots as a 60 gallon regular pot.Plenty of room for roots! If your soil doesn’t quite meet these criteria, container gardening is the way to go. You may want to use fabric bags for the blackberries … For blackberries grown in a pot, choose containers that are 5 gallons (19 l.) or larger with room for at least 6 inches (15 cm.) #4. Growing blackberry plants in containers at home is quite easy if you take proper care for soil, planting, watering, pruning, dividing, harvesting and fertilization. Blackberry roots spread out rather than down, so you can get away with a shallow container as long as you have room for the plant to develop canes. First things first, selecting the right cultivar for container grown blackberries. When to plant: Late winter or early spring. I mostly use 15 gallon. After deciding on one of the two options, it’s time to choose a container. Some of these include: Also, the erect varieties of berry that do not require trellising are ideal for container grown blackberries. Get Rid of Weeds. Otherwise, caring for blackberries in pots is more a matter of maintenance. Keep in mind that with blackberries in pots, anything in pots for that matter, require more water than if they were planted in the garden. Next, you need to select your container. If the plants appear to be outgrowing the container, divide them every 2-4 years during winter when they are dormant. Mulch around the base of the plants or heel the pots into the soil and then mulch over top. Blackberry roots spread out rather than down, so you can get away with a shallow container as long as you have room for the plant to develop canes. Containers should be, at minimum, 24 inches in diameter, but a 36-inch diameter is ideal to allow for new shoots to develop and grow. For blackberries grown in a pot, choose containers that are 5 gallons (19 l.) or larger with room for at least 6 inches (15 cm.) In 15 to 30 gallon root pouches. The exception is in the hottest parts of the country (think Deep or Coastal South, Desert Southwest). Use a complete balanced fertilizer to the feed the berries to promote fruiting. Tie up new canes that have grown during the summer. I grow Marion, New Berry, and Siskiyou in containers. Amongst these are: Next, you need to select your container. I also grow in pots and have had good success, and some bad outcomes too. Blackberries are quite easy to grow in USDA zones 6-8 but, as mentioned, once established can grow out of hand. Blackberries yield their best crops on 1-year-old canes, so as soon as you have harvested, cut down the old canes to ground level. Keep reading to find out how to grow blackberries in a container. The thornless blackberry plant may begin to grow blackberries on the canes in the first year itself. The thornless blackberry varieties are suited for pots, although any variety can be grown in a pot. Rosborough blackberries, with their signature sweetness, are perfect for eating fresh off the stem. Check to see what variety you purchased and whether it needs a trellis or not. Pour the mixture evenly over the soil surface in each container. Or grow along a fence in an espalier type of situation. To start growing blackberries in containers, you have two options to start from – bare-root or a live potted plant. Try growing thornless blackberries in a large pot or container with a climbing frame, if you keep them well watered and fertilized they will produce masses of fruit in the summer months.