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How to Grow Asparagus from Crowns

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Learn how to establish a productive home garden by growing asparagus directly from crowns. This guide is designed for gardeners of all skill levels who want to master the planting and soil preparation process. You will discover how to properly prepare your site and crowns to ensure a healthy, long-term harvest.

Safety Warnings

  • Berries produced by female plants in summer are toxic to humans; keep small children and pets away from fruiting plants.
  • Wear gloves and wash hands thoroughly after harvesting seeds from berries.

Tools Needed

Spade — Standard garden spade for digging trenches
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Kitchen knife or scissors — Clean and sharp for harvesting spears
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Materials

Asparagus crowns — 1-year-old plant buds and roots(variable)
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Compost — Well-rotted organic matter for soil enrichment(variable)
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All-purpose fertilizer — 10-10-10 NPK ratio(variable)
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Straw mulch — Soft mulch that allows shoots to grow through(variable)

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Steps

1
Choose a sunny location with rich, quick-draining soil (pH 6.5 to 7) in USDA zones 4 to 9. Enrich the soil by incorporating compost or well-rotted manure.
2
Prepare the crowns by soaking them in warm water for at least 2 hours or overnight before planting.
3
Dig a trench 12 to 18 inches wide and 8 to 10 inches deep, spacing trenches 3 feet apart. Create a small soil mound 2 to 3 inches high in the middle of the trench.
Tip: Splaying the roots over the mound helps them establish properly.
form mound trench wall bottom depth center mound Cross-section: Dig trench and raise a small central mound for root splaying
4
Place crowns on the mound bud-to-root tip in a line, spacing buds 12 to 18 inches apart. Add all-purpose fertilizer to the trench and fill it with 2 to 3 inches of soil.
fill soil 2-3 inches Crown Fertilizer Cross-section · Position crowns on the mound before adding partial soil fill
5
Water the area to settle the soil and keep it evenly moist. As spears emerge and reach several inches tall, gradually fill in the remaining soil and apply a light layer of straw mulch.
6
Maintain the plants by weeding regularly and watering deeply when the soil dries out. Feed with phosphorus and potassium (or 10-10-10) in early spring and a high-nitrogen mix after harvest.
7
Allow the plants to grow without harvesting for the first 2 years (when using crowns) to establish a strong root system. Let the ferns grow uncut during summer to provide energy for the roots.
8
Begin harvesting spears in the second or third spring when they reach 6 to 8 inches long. Cut or snap spears as close to the roots as possible without damaging the crown.
Cut low above crown 6-8" mature spear Crown Knife Cross-section · Cut spear at base to protect the crown from damage
9
Limit the first year of harvest to the first 2 weeks of growth to let ferns strengthen the plant. In subsequent years, you can extend the harvest window up to 8 weeks.
10
Cut ferns back to 2 inches in late fall only after they have completely turned brown or yellow. Apply heavy mulch in fall in cold winter regions to protect crowns from frost.

Pro Tips

  • To avoid tough, thin spears as crowns lift over time, cover beds with about 6 inches of soil every year or every other year in spring.
  • If growing female plants, cut down spears once berries form to redirect the plant's energy toward root strengthening.
  • Harvesting too late in the season will result in tough, woody asparagus.

When to Call a Professional

If your asparagus bed produces thin spears after 3 years or shows signs of rust or fusarium wilt, consult your local extension office.

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