Blues Jam™ is an astringent processing plum that needs to be blended with other plums to make jams, jellies and sauces. Blues Jam™ ripens in mid-September, about a week after Stanley. The fruit weighs about 20b with blue skin and greenamber flesh. It is self fertile with moderate mite susceptibility. The tree is medium vigor with average tolerance to Black Knot and Brown Rot.