Olallie blackberries are a vigorous trailing variety developed at the University of Oregon in 1935 from a cross between Loganberry and Youngberry parentage. The plants produce large, glossy black berries with a rich, tangy-sweet flavor that shines equally fresh off the cane or cooked into jams and desserts. Hardy in zones 6 through 11, these cane berries thrive in low-chill climates like California where other blackberry varieties struggle, and they mature within 2 to 3 years of planting. The trailing growth habit and heavy productivity make them a rewarding choice for gardeners willing to provide sturdy trellising support.
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6-11
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High
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Developed nearly 90 years ago by crossing two hybrid cane berries, Olallie carries the vigor and disease resistance of its lineage while producing exceptionally large, sweet-tart fruit. The variety's real advantage shows in warm climates with minimal winter chill, where it consistently outproduces standard blackberries. These berries shine when eaten fresh but truly excel in preserves and baked goods, where their tangy-sweet complexity becomes the star of the dessert.
Olallie berries excel in the kitchen across multiple preparations. Fresh eating showcases their large size and tangy-sweet balance, while their firm structure holds up well to canning and freezing without losing quality. They shine in jams where their flavor complexity deepens through cooking, and their natural pectin content makes jam-setting reliable. These berries also deliver exceptional results in pies, cobblers, and other cooked desserts where their slight tartness cuts through sweetness and their size creates substantial fruit presence in every bite.
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Plant bare-root or containerized Olallie canes in late fall through early spring when plants are dormant. Space them 4 to 6 feet apart in rows set 8 feet apart, allowing trailing canes room to sprawl or be trained upward. Set the crown at soil level; planting too deep invites crown rot. Water thoroughly after planting and apply 3 to 4 inches of mulch, keeping it a few inches away from the cane base.
Olallie berries ripen from mid-June through August, depending on your climate zone. Pick fruit when berries are completely black and yield slightly to gentle pressure; they should detach easily from the core when mature. Harvest every two to three days as berries ripen, as they do not continue to improve after picking. The large size makes these berries easy to spot and pick, and their firm structure means they tolerate harvest and transport better than softer blackberry varieties.
Train trailing canes onto horizontal or vertical trellising as they emerge in spring. After harvest, remove spent canes entirely, as they will not produce again; this opens the canopy to new growth. In late winter, thin out weak or crossing canes from the previous season's growth to leave 8 to 12 vigorous canes per plant, improving air circulation and fruit quality. Tip-prune the new season's canes when they reach 4 to 5 feet to encourage branching and a fuller fruiting surface.
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“Olallie blackberries emerged from deliberate breeding work at the University of Oregon in 1935, crossing two secondary hybrids, the Loganberry and the Youngberry, to combine their best traits. The resulting variety inherited the vigor and productivity of both parents while developing the cold tolerance needed for broader cultivation. This pedigree reflects early 20th-century plant breeding philosophy, where cane berry improvement focused on expanding both the flavor spectrum and the geographic regions where these fruits could be successfully grown.”