Pronounced oh-la-lee berry. Olallieberry Jam is our customers longtime favorite and continues to be our best seller year after year. This unique berry is a hybrid of Blackberry, Youngberry and Loganberry. Originally developed in Oregon it is now mainly grown in Northern California. Similar in appearance to a Blackberry yet longer, it typically measures 1 inch in length. Plump, delicate, and sumptuous, this sweet fruit is at the heart of our delicious Olallieberry Jam.