You did not say where you are planning to locate your blueberries. If on the balcony, make sure that you are aware of weight restrictions. You should consider the weight of the pot, the soil, the plant and its fruits, and the water. Get to that problem, if it is yours, before you do any more planning.
The lowbush variety, commonly called wild blueberries, is what we would recommend. Since the highbush type can reach up to eight feet tall with up to six feet spread, it is not ideal for container planting. Get a five-gallon capacity container that is at least 20 inches in width and at least 12” in depth. It is easier if your container has a welded wire cage. so that you can cover the plants when necessary to protect them from birds or from the weather.
Since you have to cross-pollinate blueberries, it is a good move to plant one early, one midseason, and one late. The bees will also help with the pollination. Plant the wildberries about three to four feet apart, and keep your soil at 4.0 – 5.0 pH. It will take your plants about two to three years to be established but, at that point, you may have berries all season. Locate the blueberry plants in full sun. You can start your plants with one inch of water each week, then increased by half an inch when they start bearing.
Since you want to plant the blueberries in container, you may want to set them on wheeled platforms for easier mobility whenever you have a need to relocate them.
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