Asparagus is one of the few perennial vegetables that grows well in NC. Once established a bed of asparagus can produce for many years. The best time to plant asparagus is late January to late March, while the plants are dormant. Asparagus likes to grow in areas that receive at least 8 hours of sunlight per day. Asparagus likes good drainage so planting in a raised bed is ideal. To produce enough asparagus for table-use plant 10 crowns per family member.
Soil preparation is important. Whether you have clay or a sandy loam amending the soil with organic matter is always encouraged. We recommend doing a soil test especially to check the pH and make sure it is around 6.2 because asparagus grows poorly in acid soils. Apply lime if needed along with the organic matter and till the soil deeply. Follow the soil test recommendation for additional fertilizer needs.
Asparagus crowns should be planted in rows 5 feet apart with the crowns spaced 12 inches apart in the row. Plant the crowns in a furrow 8 inches deep. Be sure to make the furrow wide enough to spread out the roots, and make sure the buds are pointing upward when planting. Cover the crowns with 2 inches of soil. Then pull soil around the plants gradually until the entire trench is filled. The first and second year you will be developing the crown. The third year is when you will start reaping the benefits of the spears.
In the spring just before spears start to grow, broadcast a complete fertilizer such as 10-10-10 on the bed at a rate of 4 pounds per 100 square feet.