Redberries are items used for creating dyes and making Redberry pie. Even though they are food used in cooking, they cannot be eaten unless made into a pie. They are also used in making Ranging potions.
Sold by Beefy Bill north of Lumbridge windmill for 3 coins. Up to 10 may be purchased per day.
Can be picked from the two redberry bushes on the south-east side outside Varrock's walls (see picture at the bottom right-hand corner of this page). Two berries may be picked from each bush. They take 2 minutes to regrow.
Redberries can also be grown with the Farming skill at level 10 in any bush patch, using a Redberry seed. Four berries can be picked from this bush granting 4.5 Farming experience each.
You can use redberries to make red dyes. Just ask Aggie the witch in Draynor Village to make red dye and bring her three bunches of redberries and 5 coins as a fee.