Growth Rate
Initial Growth: Asparagus is a perennial vegetable that takes some time to establish. In the first year, the growth is relatively slow as the plant focuses on developing a strong root system.
Subsequent Years: The growth rate increases in the second and third years, and you can start harvesting a light crop. full growth usually begins in the third year.
Mature Growth: Once established, 'Jersey Knight' produces spears quickly in the spring, and you can expect a productive harvest each season for 15-20 years.
Size
Height: The asparagus spears can grow up to 4 to 5 feet tall if left unharvested and allowed to fern out.
Spread: Each crown (the root system) can spread up to 1.5 to 2 feet wide over time.
Growing Conditions
Sunlight: Prefers full sun for optimal growth and spear production.
Soil: Thrives in well-drained, fertile soil with a pH of 6.5-7.5. Sandy soils are ideal, as they warm up quickly in the spring.
Watering: Requires consistent moisture, especially during the establishment period and the growing season.
Planting: Plant crowns 12-18 inches apart in trenches about 6-8 inches deep. Cover with soil as they grow.
Hardiness Zones: Suitable for USDA hardiness zones 3-8.
Harvesting
First Year: Do not harvest. Allow the plants to establish.
Second Year: Harvest lightly for about 2 weeks.
Third Year Onward: Harvest for 6-8 weeks each spring, then allow the ferns to grow and feed the roots for the next season.