Asparagus is a legendary garden performer that can produce spears for 20 years or more. By understanding how to plant dormant crowns, you can secure a reliable spring harvest for decades to come.
Choosing Your Site
Select a spot that receives full sun, ideally six to eight hours daily. Because asparagus is a long-term perennial crop, site preparation is critical. Choose a location where you won't be digging or disturbing the soil in future seasons. Asparagus thrives in well-drained, fertile soil with a pH between 6.5 and 7.0, and it is hardy in USDA zones 3 through 8.
Planting Crowns
The best time to plant is early spring, as soon as the soil can be worked. Purchase one-year-old crowns from a reputable nursery for the best success rate.
- Dig a trench 8 inches deep and 12 inches wide.
- Create small mounds of soil at the bottom of the trench, spacing them 12 to 18 inches apart.
- Spread the fleshy roots of the crown over the mound, ensuring the buds are facing upward.
- Cover with 2 to 3 inches of soil initially, filling the rest of the trench gradually as the ferns grow during the summer.
Pro tip: Avoid harvesting any spears during the first two years of growth, as this allows the root system to store the energy required for long-term survival.
Ongoing Maintenance
Keep your bed free of weeds, as asparagus does not compete well for nutrients. Apply a layer of organic compost each spring to feed the crowns. Once the harvest season ends in late spring, let the foliage grow tall and bushy. These ferns photosynthesize all summer to recharge the underground roots for next year's crop. Only cut back the dead, brown foliage in late winter before new growth emerges.
Harvesting Your Crop
By the third year, you can begin a light harvest for about two to three weeks. In subsequent years, you can extend the harvest window to six or eight weeks, or until the diameter of the emerging spears begins to thin significantly. Always snap or cut spears at or just below the soil line when they reach 6 to 8 inches in height.
With patience and proper care during the first two seasons, your asparagus patch will become the most dependable and rewarding crop in your garden.