Can I Grow Blackberries in Containers?

Yes — compact thornless blackberry varieties are well-suited to container growing and can produce a very good crop from a large pot on a patio, balcony or courtyard. The key requirements are a large enough container, a good quality compost, consistent watering, and regular feeding. Wild-type or vigorous blackberry varieties are not suitable for containers — they are too large and suckering. Modern compact varieties such as Loch Ness and Loch Tay have been specifically bred for manageable, contained growth.

Choosing the right container

Use a container of at least 45 cm diameter and at least 40 cm depth — a larger container (50–60 cm) gives better results. Heavy terracotta, large wooden barrels and substantial plastic containers all work well. The container must have adequate drainage holes — blackberries do not tolerate waterlogging, even in containers. Place pot feet or raise the container on bricks to ensure water drains freely from the bottom.

Compost and planting

Fill the container with a mix of three parts good quality peat-free multi-purpose compost and one part grit or perlite for drainage. Plant the blackberry at the same depth as in its nursery pot, with the crown at the compost surface. Add a slow-release granular fertiliser to the compost at planting according to the product instructions. Water thoroughly after planting and allow to drain.

Watering and feeding

Container blackberries dry out faster than those in the ground and require watering two to three times per week in summer, or daily in hot dry spells. The compost should be moist throughout but never waterlogged. From late spring onward, apply a high-potash liquid fertiliser (tomato feed is ideal) once a week through the growing and fruiting season. This drives flower and fruit production rather than excessive leaf growth.

Annual repotting

Every two years, remove the plant from its container in late winter, loosen the root ball, trim any circling or dead roots, and replant into fresh compost in the same or a slightly larger container. This prevents the root ball becoming compacted and nutrient-depleted, both of which significantly reduce productivity over time.