Nasturtium Cultivation Explained
Introduction
Nasturtium (Tropaeolum majus) is a vibrant and versatile plant that has captivated gardeners and culinary enthusiasts alike. Known for its striking flowers and peppery leaves, nasturtium is more than just an ornamental plant; it is also a valuable ingredient in various culinary applications. This article delves into the cultivation of nasturtium, exploring its history, production methods, quality grading, and much more.
What Is Growing?
Growing refers to the process of cultivating plants for various purposes, including culinary use, ornamental value, or medicinal properties. In the context of nasturtium, growing involves understanding the plant’s lifecycle, optimal growing conditions, and care requirements. Nasturtium is an annual plant, meaning it completes its life cycle within one growing season. Its rapid growth makes it an ideal choice for both novice and experienced gardeners.
History and Origins
Nasturtium originates from the Andean regions of South America, particularly Peru and Bolivia. The plant was brought to Europe in the 16th century, where it quickly gained popularity for both its aesthetic appeal and culinary uses. The name “nasturtium” is derived from the Latin words “nasus” (nose) and “tortus” (twisted), referencing the plant’s peppery flavor that can evoke a strong sensory response.
Historically, nasturtium has been valued not only for its culinary applications but also for its ability to attract beneficial insects and deter pests. The plant has a rich cultural significance, often associated with traditional gardens and folk practices.
Production and Processing
1. Cultivation Conditions
Nasturtium thrives in well-drained soil with a pH level between 6.0 and 7.0. It prefers full sun but can tolerate partial shade. The plant is relatively drought-resistant, making it suitable for various climates.
2. Sowing Seeds
Seeds can be sown directly into the garden after the last frost or indoors for later transplanting. When sowing seeds, space them approximately 10-12 inches apart to allow for adequate growth. The seeds should be planted about 0.5 inches deep in the soil. Germination typically occurs within 10-14 days.
3. Care and Maintenance
Nasturtium requires minimal maintenance. Regular watering is essential, particularly during dry spells, but overwatering should be avoided to prevent root rot. Fertilization is generally unnecessary, as nasturtium thrives in nutrient-poor soils. Pests such as aphids may occasionally attack the plant, but these can often be managed through natural predators or insecticidal soap.
4. Harvesting
The flowers and leaves of the nasturtium plant can be harvested throughout the growing season. It is best to harvest in the morning when the dew has dried, as this helps preserve the plant’s flavor and aroma. When harvesting, cut flowers and leaves with clean scissors to avoid damaging the plant.
Quality and Grading
1. Appearance
High-quality nasturtium should have vibrant colors, whether in the flowers or the leaves. The flowers should be intact and free from blemishes, while the leaves should be crisp and green.
2. Flavor Profile
The flavor of nasturtium is often described as peppery, similar to arugula or watercress. Quality leaves should have a fresh and slightly spicy taste, while the flowers should offer a milder, sweet flavor.
3. Storage Conditions
For optimal quality, harvested nasturtium should be stored in a cool, dark place. If not used immediately, it can be wrapped in a damp paper towel and placed in a plastic bag in the refrigerator.
Buying Considerations
When purchasing nasturtium, whether fresh or as seeds, consider the following factors:
1. Source
Opt for organic sources if you are concerned about pesticides and chemical fertilizers. Local farmers’ markets or specialty grocery stores often carry fresh nasturtium.
2. Seasonality
Nasturtium is typically in season during the warmer months, so purchasing out of season may result in lower quality or higher prices.
3. Varieties
There are various cultivars of nasturtium, each with unique characteristics. Some popular varieties include ‘Alaska,’ known for its variegated leaves, and ‘Empress of India,’ which boasts deep red flowers. Understanding the specific traits of each variety can help in making an informed purchase.
Uses and Applications
Nasturtium serves a multitude of purposes in culinary and ornamental applications:
1. Culinary Uses
The leaves and flowers of nasturtium can be used in salads, as garnishes, or infused into oils and vinegars. Their distinctive flavor adds a peppery kick to dishes, making them a favorite among chefs.
2. Ornamental Uses
Beyond culinary applications, nasturtium is often used in gardens for its visual appeal. Its trailing vines and bright flowers can enhance the aesthetics of flower beds, hanging baskets, and containers.
3. Companion Planting
Nasturtium is beneficial in companion planting, as it attracts pollinators and repels aphids and other pests. This makes it an excellent choice for organic gardens.
Storage and Shelf Life
Fresh nasturtium can be stored in the refrigerator for up to a week. To maintain its quality, it is advisable to keep the leaves and flowers in a damp paper towel within a sealed plastic bag. For longer storage, nasturtium can be dried, though this may alter its flavor and texture.
Common Misconceptions
Despite its popularity, nasturtium is often surrounded by misconceptions:
1. Edibility of All Parts
While the leaves and flowers are edible, the seeds should be avoided as they can be toxic in large quantities. They are sometimes