Q.What makes my blackberries sour
My berries are very large but so sour. They lock your jaws. What can I do to make them sweet?
Downtoearthdigs
Answered on June 23, 2015
Blackberries need water, 1 to 2 inches a week from May through October.
Are these bushes old? Blackberries produce 15 to 20 years.
Don't pick to early, they may look ripe, but if they are still shiny it's to early. The deep color should be dull.
Still to sour, try making them into jam or jelly and sugar them up.
https://www.gardeningknowhow.com/edible/fruits/berries/harvesting-berries.htm
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