Anything you added to the soil would not increase the sweetness of your berries. If harvested too early, blackberries will be sour. Even once they have turned black, you should wait to pick them until the shine has gone away and the berries are dull. The sugar levels increase as the berry becomes a dull color.
Hi David,
Anything you added to the soil would not increase the sweetness of your berries. If harvested too early, blackberries will be sour. Even once they have turned black, you should wait to pick them until the shine has gone away and the berries are dull. The sugar levels increase as the berry becomes a dull color.
Hope this helps!