11 Tips for Growing 10-Foot Asparagus
While most asparagus varieties grow to about 4–6 feet in height once mature, some gardeners aim for exceptional results, including towering 10-foot asparagus plants. Though rare and dependent on various factors such as genetics, soil health, and growing conditions, achieving towering asparagus is possible with the right care. Here are 11 expert tips to help you grow asparagus to impressive heights.
1. Choose a Tall Variety
Not all asparagus plants have the genetics to reach 10 feet. Some heirloom or wild varieties, like Asparagus officinalis, can grow taller under optimal conditions. Do your research and look for varieties known for vigorous fern growth.
2. Start with Healthy Crowns
Begin with strong, disease-free one-year-old crowns from a reputable supplier. Healthy crowns are more likely to establish well and grow vigorously over the years.
3. Give Them Space
Asparagus plants need room to grow deep and wide roots. Space crowns at least 18 inches apart in rows that are 4–5 feet apart. Proper spacing reduces competition and allows each plant to thrive.
4. Enrich the Soil Deeply
Asparagus is a heavy feeder and prefers rich, well-drained soil. Before planting, dig deeply and incorporate aged manure, compost, and a balanced organic fertilizer. Aim for soil with a pH between 6.5 and 7.0.
5. Plant in Full Sun
Asparagus needs a minimum of 8 hours of direct sunlight daily. Select a site with full sun exposure to encourage robust growth and tall, leafy ferns.
6. Water Consistently
Asparagus needs steady moisture, especially in its first few years. Water deeply at least once a week, more often during hot or dry spells. Use mulch to retain soil moisture and reduce weed competition.
7. Allow the Ferns to Grow
For truly tall asparagus, you must allow the ferns to grow fully during the summer. Resist the urge to trim them down, even if they appear unruly. These ferns feed the crowns and are essential for vigorous spear production and overall height.
8. Feed Regularly
Supplement your asparagus with a balanced fertilizer (10-10-10) or side-dress with compost during the growing season. A mid-summer feeding supports fern development and crown strength.
9. Provide Support
As asparagus ferns can grow very tall and bushy, especially with ideal care, use stakes or cages to prevent them from falling over in wind or rain. Keeping them upright reduces stress and promotes further growth.
10. Practice Patience and Persistence
Asparagus doesn’t reach its full potential until its third or fourth year. Be patient and avoid harvesting heavily during the first two years. Each growing season strengthens the root system and increases the plant’s ability to grow taller.
11. Protect from Pests and Disease
Keep a watchful eye for asparagus beetles, rust, and other diseases that can weaken plants. Handpick pests, rotate crops, and use organic sprays or neem oil as needed. Healthy, pest-free plants grow taller and more vigorously.
Final Thoughts
Reaching the elusive 10-foot mark with asparagus is an ambitious but achievable goal with the right techniques. Focus on providing excellent soil, consistent care, and long-term patience. Even if your plants don’t hit 10 feet, following these tips will ensure a vigorous, productive asparagus bed that will reward you for decades.
