VegetableAsparagus
Jersey Knight Asparagus
Hybrid
Jersey Knight Asparagus is a vigorous hybrid cultivar bred for cold tolerance and disease resistance, thriving across hardiness zones 3 through 10. This perennial vegetable produces thick, flavorful spears year after year once established, reaching full maturity in 365 days from planting. Unlike many asparagus varieties, Jersey Knight's hybrid vigor and robust root systems make it especially reliable for northern gardeners, delivering consistent harvests for decades with proper care.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-10
Sunlight
Full Sun
Water
High
Soil
Well-drained, Fertile Loam; Rich In Organic Matter
Preferred Temp65-85°F
Growth Stats
60 in
Height
—
Width
10 in
Spacing
365–365
Days to Harvest
PeriodPerennial
TypeBush
Plant Profile
Sunlight
Full Sun
Water
High
Zones
3-10
Size
60in H x ?in W
Growth
Perennial
Care
High
Hover over chart points for details
Highlights
Jersey Knight earns its reputation through exceptional hybrid vigor and disease resistance to both Fusarium Wilt and RR strains, a significant advantage over open-pollinated varieties that struggle with these soilborne pathogens. The plants grow upright to 4-5 feet tall, with male-dominant genetics that produce the thick, tender spears gardeners crave rather than the smaller, berry-producing female plants. Cold hardiness down to zone 3 means this asparagus thrives where many other cultivars falter, making it the practical choice for northern regions.
Common Uses
Jersey Knight spears are harvested fresh and prepared as a spring vegetable, grilled, steamed, roasted, or blanched for raw preparations. The thick spears hold their texture through cooking, making them suited to high-heat applications like roasting or pan-searing where thinner varieties would become mushy. Once established, a Jersey Knight bed becomes a reliable source of fresh asparagus for nearly three weeks each spring.
Growing Timeline
First Bloom
Early Spring
First Harvest
Third Growing Season
Last Harvest
Early Summer
Care Instructions
Start Indoors
Start seeds indoors 60-90 days before your last frost date in a warm environment maintained between 60-75°F. Keep soil consistently moist but not waterlogged. Transplant seedlings outdoors after all danger of frost has passed and the soil has warmed.
Transplant Outdoors
Transplant seedlings or one-year-old crowns outdoors after the danger of frost has passed. Dig trenches 6-8 inches deep and place crowns with roots spread radially, then gradually backfill as shoots emerge during the first season. Space crowns 10 inches apart in rows 24 inches apart. Jersey Knight's cold tolerance allows earlier spring planting than many vegetables.
Direct Sow
Direct sowing is not recommended for asparagus. Use transplants or one-year-old crowns instead.
Harvesting
Begin light harvesting only in the third year after planting, taking just a few spears to avoid exhausting young crowns. By year four and beyond, harvest spears when they are 6-10 inches tall and 1/2-3/4 inch thick, cutting approximately 1 inch below the soil surface with a sharp knife or snapping them off by hand. Check beds frequently as spears develop quickly and become woody if left in the ground too long. Harvest for 2-3 weeks each spring from established beds; a moderate harvest window is normal and prevents crown depletion.
Pruning
Allow asparagus foliage to grow fully after the harvest season ends (typically mid-June); the ferny green growth feeds the roots for next year's spear production. Cut back all foliage in late fall or early winter once it has yellowed and dried completely. Do not prune or cut foliage during the growing season after harvest ends, as this weakens the crown.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Scientific Classification
Asparagus L.
Family
Asparagaceae
Genus
Asparagus
Duration
Perennial
Growth Habit
Upright
Native Status
L48 (I)CAN (I)SPM (I)
History & Origin
“Jersey Knight represents a watershed moment in asparagus breeding, developed as a hybrid cultivar specifically to address the disease pressures and climate challenges that plagued traditional varieties. Breeders selected for male-dominant plants, recognizing that male asparagus plants consistently produce larger, more tender spears while female plants waste energy on seed production. This deliberate breeding strategy transformed asparagus from a temperamental heirloom crop into a reliable performer for home and commercial growers across diverse climates.”