You can encourage blueberry bushes produce fruit by giving them four key things they need most. Those four things are cross pollination, proper soil pH, yearly pruning, and steady moisture. Missing any one of these limits your harvest. Get all four right and your bushes will reward you with heavy yields year after year.
I struggled with sparse harvests for three years before I made some key changes to my blueberry patch. My single bush produced just a handful of berries each summer no matter how well I watered it. Adding two more varieties for pollination doubled my harvest the very next year. Then I started pruning and watching soil pH which pushed my yields even higher.
Blueberry fruit production depends on pollination more than most growers know at first. Even self fertile varieties make bigger berries when other types grow nearby. WVU Extension says cross pollination makes larger fruit. Plant at least two different varieties that bloom around the same time for best results.
I tested this myself by counting berries on branches near my different varieties one summer. Branches closest to a second variety set thirty percent more fruit than branches on the far side of the bush. The difference was clear once I knew what to look for in my garden.
Your soil pH controls whether plants can take up the nutrients they need to set fruit. Blueberries want soil between pH 4.5 and 5.0 for peak production levels. Test your soil each spring and add sulfur if pH drifts above 5.0 over time. Yellow leaves and weak growth signal pH problems that limit fruit set.
Fruit forms on one year old wood that grows from mature canes on your bush. UMD Extension research shows that five year old canes produce the most fruit overall. Younger canes have not reached peak production yet. Canes older than six years start to decline and should come out.
To increase blueberry yield you need to prune every year during winter while plants stay dormant. Remove any dead or damaged wood first. Cut out old canes at ground level when they reach six or seven years of age. Thin crowded areas to let light and air reach all parts of the bush.
Water plays a bigger role in berry size than many growers think about when planning care. Give plants about 1 inch (2.5 centimeters) of water per week during the growing season. Increase to 4 inches during the weeks when berries ripen on the bush. Dry spells lead to small berries that drop early before you can pick them.
Start your improvement plan with a soil test to check your current pH level this spring. Add sulfur if you test above 5.0 and retest in six months. Plant at least one more variety if you only have one bush right now. Set up a drip line or watering schedule so plants never go dry during fruit time. Prune each winter to remove old canes. These steps will boost your harvest within one or two seasons.
Read the full article: Growing Blueberries: 7 Steps for Success
