Why are my blackberries sour? The plant itself is beautiful and the blackberries look fabulous, but when you eat them, UGH! They're sour. I've had the plant for about 5 years and it's the same every year. Not a sweet one yet!
Certified GKH Gardening Expert
My guess would be that you may simply be picking them too early. Most people tend to pick blackberries when they are a nice glossy, dark color when in fact you should wait for them to dull in color before harvesting.