Silk Hope Mulberry is a rare hybrid that bridges American and Asian mulberry heritage, combining the cold hardiness of native species with the vigor of the ancient silkworm-supporting varieties. This 20-foot tree flourishes in zones 7-10 and produces abundant sweet berries from June through August, ripening through the summer months. Its roots run deep in American history: the variety traces to A. J. Bullard's work breeding M. alba with native M. rubra, drawing on a legacy that reaches back to North Carolina's early 19th-century silk industry. Thriving in full sun with moderate soil pH between 5.5 and 7.5, it combines disease resistance with the hardiness and productivity that made it worth preserving.
Full Sun
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7-10
240in H x ?in W
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Moderate
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Silk Hope carries the weight of a nearly-forgotten agricultural heritage; it's one of the few mulberries that bridges the silkworm legacy of imported varieties with the toughness of American native stock. The tree produces prolifically in heat and humidity, a real advantage for gardeners in challenging climates, and its extended bloom window from June through August means a long season of ripening fruit. This is not a newfangled hybrid but a chance wild cross discovered decades ago by a breeding legend, which means every tree you grow is participating in the preservation of American agricultural history.
Mulberries from Silk Hope are eaten fresh off the tree, a delicacy most home gardeners experience as a summer nibbling plant rather than a commercial crop. The berries ripen across the extended bloom period from June through August, creating an ongoing supply for fresh eating. Some gardeners preserve the harvest through freezing or making preserves, though the extended ripening window means you're often eating them as quickly as they mature rather than harvesting en masse.
No timeline data available yet for this variety.
Bare-root mulberry trees are typically planted in late winter to early spring, before buds break. Space trees at least 15-20 feet apart given their mature height of 20 feet, ensuring good air circulation and room for the canopy to develop fully. Plant in full sun in a location with well-draining soil adjusted to the 5.5-7.5 pH range. Water thoroughly after planting and maintain consistent moisture through the first growing season.
Mulberries on Silk Hope ripen from June through August as they darken in color; berries reach peak sweetness when they shift from red to deep purple or black. Pick berries by gently cupping and twisting, allowing ripe fruit to drop into your hand. Harvest frequently during the ripening window to encourage continued production and to catch fruit at its sweetest moment, as mulberries continue to ripen gradually across the extended bloom period rather than all at once.
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“Silk Hope's story is woven through the industrial aspirations and ecological realities of early American agriculture. In the early 1800s, North Carolina embraced sericulture, importing Morus alba mulberries from Asia specifically to feed silkworms and establish a domestic silk industry. This ambition collided with economic reality; foreign competition swiftly eclipsed American silk production, and most of those imported trees faded from memory. Silk Hope emerged as a chance wild cross discovered by A. J. Bullard, a legendary mulberry breeder who recognized something valuable in this hybrid of M. alba (the silkworm mulberry) and M. rubra (the native American red mulberry). By crossing an imported species with native stock, Bullard created a tree that inherited the vigor and heat tolerance of American genetics while retaining the productive character of its Asian parent. The variety survives today as a living record of that hybrid moment, a physical bridge between two agricultural worlds that nearly never met.”