My blueberry plants are producing lots of berries, but they are all sour---any ideas?
Certified GKH Gardening Expert
Allow the berries to remain on the bush a little longer. They may not be fully ripened yet. Look for a dark navel when harvesting blueberries, not the color of the fruit. Blueberries with a reddish color around the stem end are not ripe, and will be tart. However, those left onthe bush to become fully deep blue will be ripe and sweet. The following article should be of some help to you: https://www.gardeningknowhow.com/edible/fruits/blueberries/growing-blueberry.htm