Planting and growing sweet purple asparagus can be a fulfilling project for gardeners, offering unique flavors and a striking appearance to any garden. This article provides a comprehensive guide on how to plant sweet purple asparagus, its characteristics, and why it's favored by gardeners.

Origin and History of Purple Asparagus

The history of purple asparagus is fascinating, adding another layer of appreciation for this unique vegetable.

Ancestral Roots

Asparagus, in general, has a long history dating back to ancient times. It was known and appreciated in ancient Egypt, Greece, and Rome for its culinary and medicinal properties. The green asparagus varieties are more commonly known and have been cultivated for centuries.

Development of Purple Varieties

The development of purple asparagus is a more recent advancement in horticulture. Purple varieties, like the popular 'Purple Passion', were developed through selective breeding. These breeding programs aimed to enhance certain desirable traits such as the striking purple color, higher sugar content, and tender texture.

Purple Asparagus Today

Today, purple asparagus is grown in various parts of the world and is particularly appreciated for its unique aesthetic and flavor profile. It remains less common than the green and white varieties, making it a special find in markets and gardens.

The Role of Anthocyanins

The purple color in asparagus is due to anthocyanins, natural pigments that are also responsible for the colors of blueberries, red grapes, and other purple or red fruits and vegetables. These pigments not only provide the vibrant color but are also associated with various health benefits, including antioxidant properties.

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Characteristics of Sweet Purple Asparagus

Sweet purple asparagus stands out for its deep-burgundy colored spears and a higher sugar content, about 20% more than its green counterpart. This additional sweetness allows the vegetable to be often enjoyed raw. When cooked, it offers a mild, nutty flavor. The spears are larger and more tender than green asparagus, with less lignin per spear, making them less stringy and allowing cooks to use the entire spear with little waste​.

Why Gardeners Like Sweet Purple Asparagus

Gardeners have a special affinity for sweet purple asparagus due to several compelling reasons that extend beyond its unique appearance and taste. Here's an expanded look at why this variety is particularly favored:

1. Aesthetic Appeal: The deep, vibrant purple color of the spears adds a striking visual contrast to the garden. This makes the sweet purple asparagus not just a vegetable but also an ornamental plant, appealing to gardeners who value both beauty and utility in their gardening endeavors.

2. Enhanced Sweetness and Flavor: As mentioned, sweet purple asparagus has a higher sugar content compared to the green variety, which translates to a sweeter taste. This mild, nutty flavor is not only a delight in various dishes but also makes it a favorable choice for eating raw, in salads, or as a standalone snack.

3. Tender Texture: The spears of the purple variety tend to be more tender and less fibrous than green asparagus. This quality minimizes the need for peeling and reduces waste, as more of the spear is edible and enjoyable.

4. Nutritional Value: Purple asparagus, like its green counterpart, is nutritious, packed with vitamins, minerals, and antioxidants. The presence of anthocyanins, which give the vegetable its purple color, adds an extra health benefit due to their antioxidant properties.

5. Versatility in Cooking: The sweet purple asparagus is versatile in the kitchen. It can be used in a wide range of recipes, from simple grilled dishes to complex gourmet creations. Its unique color can be a focal point in presentations, making it popular for special occasions and fine dining experiences.

6. Gardening Challenge and Reward: For some gardeners, growing something unusual like purple asparagus adds an exciting challenge to their gardening experience. The successful cultivation and harvest of this less common variety can be particularly rewarding.

7. Longevity and Yield: As a perennial plant, asparagus can provide a yield for many years after initial planting, sometimes up to 20 years. This long-term yield is appealing to gardeners looking for plants that offer both sustainability and productivity.

8. Adaptability: Sweet purple asparagus can adapt to a variety of climates (suitable for USDA zones 3-10), making it accessible for many gardeners across different geographical locations.

Planting Guide for Sweet Purple Asparagus

Pre-Planting Preparation

1. Site Selection: Choose a location with well-drained soil and ample sunlight (at least 6-8 hours daily).
2. Soil Preparation: Enhance the soil with organic matter like compost and ensure a pH level between 6.5 and 7.2 for optimal growth.
3. Asparagus Crowns: Purchase healthy, disease-free crowns from a reputable source.

Planting Process

1. Trench Preparation: Dig trenches about 8-10 inches deep and 12-18 inches apart.
2. Planting the Crowns: Place crowns in the trenches, spacing them 12-18 inches apart, and cover with 2-3 inches of soil.
3. Watering and Mulching: Maintain consistent soil moisture and use mulch to retain moisture and suppress weeds.

Post-Planting Care

1. Weed Control: Regularly remove weeds to reduce competition for nutrients.
2. Fertilization: Apply a balanced fertilizer sparingly in early spring.
3. Support: Use stakes or trellises to support the growing plants.

Harvesting

1. Timing: Start harvesting in the second or third year after planting when the spears are 6-8 inches tall.
2. Method: Harvest by snapping or cutting the spears at ground level.

Ongoing Maintenance

1. Pruning: Prune the ferns down to ground level in late winter or early spring.
2. Pest Control: Monitor for pests like asparagus beetles and aphids, and use organic control methods as needed.

Supplies Needed for Planting Asparagus

To successfully plant sweet purple asparagus, you'll need the following:

• Asparagus crowns
• Compost or well-rotted manure
• Balanced fertilizer
• Mulch (straw or compost)
• Garden tools (spade, hoe, etc.)
• pH meter to test soil acidity
• Watering system or hose
• Stakes or trellis for support

In Summary

Growing sweet purple asparagus is a rewarding experience that offers both aesthetic and culinary benefits. By following these guidelines, even first-time gardeners can successfully cultivate this unique variety, enjoying its delightful flavor and texture for years to come.

Additional Resources

1. UC Master Gardener Program: This site emphasizes the importance of choosing a location with good drainage and full sun. It details the trench method for planting asparagus, stressing the need for well-prepared soil enriched with organic matter. It also provides guidelines on planting depth, spacing, and ongoing care such as watering and weed control​.

2. Purdue University Extension Master Gardener Program: While this site primarily focuses on the Master Gardener program, it also offers resources on gardening topics, including asparagus cultivation. The program is a rich resource for gardening enthusiasts seeking in-depth knowledge and community engagement​.

3. UC Master Gardeners of Santa Clara County: This resource offers a comprehensive guide to asparagus cultivation. It covers everything from selecting a planting site to understanding the differences between male and female asparagus plants. The site also provides details on when and how to plant, as well as care and harvesting tips​.

4. UC Master Gardener Program of Sonoma County: This website provides detailed advice on harvesting asparagus, including when to start harvesting and how to increase yields over time. It also offers additional resources related to vegetable planting and integrated pest management​.

5. UMN Extension: The University of Minnesota Extension provides insights into the planting process for asparagus, including the importance of soil moisture and fertilization. It also discusses starting asparagus from seeds, a less common but viable method​.

6. Illinois Extension, UIUC: This resource offers practical advice on where and how to plant asparagus, emphasizing the importance of site selection due to the perennial nature of asparagus. It also provides tips on weed control and fertilizing, critical aspects of asparagus cultivation​.

7. NC State Extension: This website offers general information about asparagus cultivation and directs users to local Cooperative Extension offices across North Carolina for more specific guidance​.

8. Penn State Extension: While the specific content on asparagus cultivation wasn't accessible during the search, Penn State Extension is known for its comprehensive agricultural guides and could be a valuable resource for growing asparagus​.