Nurseries and garden centers carry containerized blueberry bushes in standard plastic pots that are not designed for long-term use. These pots crack and degrade. Remove blueberry plants from these temporary pots right away.
Repot blueberry bushes in the spring, before the bush shows new growth. To control the size of the bush, trim the outer 1 to 2 inches of the root ball and replant in the same container. The bush regrows feeder roots over the course of the growing season.
Repot blueberries if the planting container cracks. A cracked pot could break open, leaving sharp shards and an exposed root ball.
A pot-bound plant's roots encircle to pot, growing along the perimeter where there is no insulating soil. The plant dries out quickly and grows poorly. Repot pot-bound plants as soon as the condition is noticed.
The root systems of potted blueberries need winter protection. Move pots to a protected outdoor location and mulch heavily.