Blackberries are very high in antioxidants, one of the highest of all fruits! Sometimes they are called a "superfood" because of the many nutrients and health benefits they have. They are very popular in jams, jellies, wine, and desserts.
Blackberries should be firm, plump, shiny and even deep purple color. Avoid berries that are bruised or leaking.
Store blackberries in the refrigerator up to 1 week in a ventilated container. Wash prior to using.
Iowa Specialty Crop Growers Association
Data credit 1
ISU Extension and Outreach