Blueberries do grow well in the St. Paul, Minnesota area. The weather is right but the soil is too heavy for the blueberry bushes. Blueberries natually grow in sandy soil where pine trees like to grow like the Upper UP. You can find them growing wild in the northern climates but here they need special attention.
If you are lucky to have a good crop of blueberries growing you need to care for them so they can survive the winter and come back in the spring to grow new tasty berries. Cover your plants with organic straw to protect them for the harsh winter elements. Then in the spring before the plants come back to life take the straw off of the plants. You can leave it on the ground as a bedding.
Blueberries like pine needles so you can cover them with pine needles in winter and in the spring take them off and let the pine needles stay on the ground surrounding the plants. The pine needles add nutrients to the soil that blueberries thrive on and they also help keep the soil around the plant light and airy.
Potted blueberries can benefit from pine needles too. If you plant your blueberry plants in containers you may find them easier to care for. You can plant them in sandy soil and cover them easily in the winter. You can even pull them into a a garage or shed where they will be more protected over the winter months. hten bring them out again when the weather starts to get better. Blueberries need to have a winter freeze so do not store them in a place that will not freeze yet they like protection from wind and weather.