Troubleshooting
Duke Blueberry problems — and how to fix them
Duke Blueberry (Vaccinium corymbosum 'Duke') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Chlorosis from alkaline soil
In limy or high-pH soil the leaves yellow between green veins as iron becomes unavailable. Acidify with ericaceous compost and sulphur, and water with rainwater.
Poor cropping without a pollination partner
Though partly self-fertile, 'Duke' yields far better with another highbush variety nearby. Plant a compatible early-mid-season blueberry to boost fruit set.
Birds stripping ripe fruit
Birds rapidly strip ripening berries. Net the bushes or use cages as the fruit begins to colour to protect the crop.
Drought stress on shallow roots
Its shallow fibrous roots dry out fast, causing wilting and fruit drop. Mulch well and water consistently, especially during fruit swell and hot spells.
Prevent duke blueberry problems before they start
Most duke blueberry issues are care-mismatch, not bad luck. Dial in the basics:
Looking for duke blueberry in general rather than its problems? Read the full duke blueberry care guide — light, water, soil and feeding.
Duke Blueberry problems — FAQ
Why is my duke blueberry chlorosis from alkaline soil?
In limy or high-pH soil the leaves yellow between green veins as iron becomes unavailable. Acidify with ericaceous compost and sulphur, and water with rainwater.
Why is my duke blueberry poor cropping without a pollination partner?
Though partly self-fertile, 'Duke' yields far better with another highbush variety nearby. Plant a compatible early-mid-season blueberry to boost fruit set.
Why is my duke blueberry birds stripping ripe fruit?
Birds rapidly strip ripening berries. Net the bushes or use cages as the fruit begins to colour to protect the crop.
Why is my duke blueberry drought stress on shallow roots?
Its shallow fibrous roots dry out fast, causing wilting and fruit drop. Mulch well and water consistently, especially during fruit swell and hot spells.