Blues Jam is a European plum that transforms into a heavy-bearing fruit tree in zones 5 through 9, reaching a mature height of 12 feet. This Damson-type cultivar produces small, dark blue freestone plums with a distinctive sweet-tart flavor and dense flesh that makes exceptional preserves. The tree reliably sets enormous crops, so abundant that the branches appear draped in thick, dark blue ropes from a distance, while its upright habit and disease resistance make it straightforward to grow.
Full Sun
Moderate
5-9
144in H x ?in W
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High
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From across the garden, a mature Blues Jam looks draped in heavy, dark blue cords of fruit covering nearly every branch. The small Damson-style plums carry a sweet-tart bite and freestone character that releases cleanly from the pit, making them naturally suited to preserves and jams. This tree is reliably self-fertile, so you need only one plant to harvest abundantly, and it handles disease pressure with the resilience that makes it genuinely easy to grow.
Blues Jam excels at preserves and jam-making, where its dense, tart flesh and freestone nature shine. The astringency characteristic of Damson-style plums softens through freezing and thawing the raw fruit before using, or by blending with other fruits or plum varieties, giving home preservers flexibility in balancing flavor. Home gardeners also blend these plums with sweeter varieties to create complex, layered flavors in fruit spreads.
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Pick plums when they reach full dark blue color and yield slightly to gentle pressure, indicating full ripeness. Harvest in late summer to early fall when the fruits detach easily from the branch with a gentle twist. For fresh use, pick slightly firmer fruits; for preserves, wait for complete softness to maximize juice and flavor concentration.
Prune to maintain the upright habit and open the center for light penetration and air circulation, which supports disease resistance. Remove crossing or crowded branches in late winter before bloom, favoring the natural upright form. Minimal pruning is needed once the tree is established, as Blues Jam naturally grows in a manageable shape.
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