Hybrid Asparagus
Millennium Asparagus is a cold-hardy F₁ hybrid developed at the University of Guelph in Ontario, Canada, and released in the early 2000s as a major breakthrough for northern gardeners. This all-male variety produces abundant medium to large spears with outstanding cold tolerance and disease resistance, thriving in zones 3 through 8. It reaches 12 to 36 inches tall and takes three years to come into full production, but once established, it yields substantially more than older 'Jersey' hybrids and can produce for 15 years or longer with proper care.
Full Sun
High
3-8
36in H x ?in W
Perennial
High
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Millennium stands out as a deliberate solution to a real problem: older asparagus varieties wasted energy producing female plants that make seeds instead of spears. This all-male hybrid redirects that energy entirely into thick, tender spears, with field trials in northern Minnesota documenting yields of 2,094 pounds per acre, outperforming 'Jersey Giant'. Its University of Guelph lineage means it was engineered specifically for harsh winters and strong disease resistance, making it the rare vegetable variety that gets better the further north you garden.
Millennium Asparagus spears are harvested young and tender, typically 6 to 10 inches tall, and can be used fresh in salads, steamed, grilled, stir-fried, or pickled. The variety excels at freezing, making it especially valuable for gardeners who want to preserve their harvest. Its high spear quality and tender texture mean it shines in any preparation where you want the asparagus flavor to be the star.
Start transplants 60 to 90 days before your last spring frost date in a warm growing environment. Transplant seedlings outdoors only after the danger of frost has completely passed and soil has warmed.
Transplant established crowns or seedlings after frost danger is over. Plant crowns in deeply prepared beds with the crown about 2 inches below the soil surface, spaced 10 inches apart in rows 3 inches apart. Water thoroughly after transplanting and maintain consistent moisture.
Direct sowing of asparagus seed is not recommended; transplants or root crowns are the preferred method.
Do not harvest during the first one to two years after planting; allow crowns to build strength. In year one after planting, you can take a light harvest of 7 to 10 days in spring. In year two, harvest for 2 to 3 weeks, and by year three and beyond, harvest for up to 6 weeks. Cut or bend spears when they are 6 to 10 inches tall and between 1/2 to 3/4 inch thick, cutting about 1 inch below the soil surface. Stop harvesting when spears become thinner than pencil-size, as this indicates the crowns need energy to replenish. Check plants frequently during the spring bloom period (March through May), as spears develop quickly and will become tough and woody if left unharvested.
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“Millennium Asparagus was developed by Dr. Dave Wolyn at the University of Guelph in Ontario as a public-domain F₁ hybrid, released in the early 2000s with a specific goal: to replace the older 'Jersey' male hybrids by increasing the proportion of male plants and boosting spear yield while extending bed lifespan. The breeding strategy was elegantly simple but powerful. Since asparagus is dioecious (having separate male and female plants), and female plants waste resources producing berries instead of the tender spears gardeners want, breeding for all-male offspring meant every plant would focus its energy on production. This wasn't theoretical work either; northern Minnesota trials proved the variety significantly outperformed the previous standard. Millennium represents one of the clearest examples of modern vegetable breeding solving a real agronomic problem with precision.”