Vigna unguiculata 'Metro Black' – rare garter with long black pods

Vigna unguiculata , commonly known as asparagus bean or yardlong bean, is an annual climbing plant notable for its long, slender pods and robust growth. The cultivar 'Metro Black' is a unique variety with deep black seeds and impressive, long green pods that can grow up to 60 cm.

This rare asparagus bean originates from Asia and is ideal for gardeners seeking both a decorative and culinary climber. 'Metro Black' requires warm, sunny conditions and a climbing support to grow optimally and produce a bountiful harvest.

Description and features

Vigna unguiculata 'Metro Black' is a tall and vigorous climber that produces impressive pods.

• Flowers: Light purple to white, trumpet-shaped, nectariferous and attractive to bees and other pollinators.

• Pods: Green, slender and up to 60cm long; the young pods are sweeter than regular pole beans, and when fully ripe they contain black seeds.

• Growth: Very vigorous; the plant can grow up to 100 cm tall and requires vertical support such as stakes or trellis.

• Origin: Asia; popular for its long pods, black seeds, and graceful appearance.

The combination of long pods, black seeds and robust growth makes 'Metro Black' both culinary and visually appealing.

Cultivation and care

Vigna unguiculata 'Metro Black' requires warm conditions and can be sown indoors or directly outdoors:

• Pre-sowing: Early April indoors in small pots at 20–25 °C.

• Direct sowing: Mid-May to mid-June in warm locations; sow in rows similar to pole beans.

• Position: Full sun; a sheltered, warm location promotes healthy growth.

• Soil: Well-drained, humus-rich and fertile; slightly moist and neutral in pH is ideal.

• Watering: Water regularly, especially during dry periods; avoid waterlogging and wet tillage.

• Support: Use stakes, trellises, or pergolas; hilling up later is recommended.

• Harvest: From late July to October; harvest young pods for best flavor.

With this care, 'Metro Black' will grow into a productive, impressive climber that offers both ornamental value and edible yield.

Culinary application

The young pods of 'Metro Black' are sweeter and more tender than regular pole beans:

• Preparation: Boil, steam, stir-fry or stir-fry.

• Storage: Pods can be frozen for later use.

• Nutritional value: Rich in vitamins, minerals and fiber; a healthy addition to salads, stews and side dishes.

The combination of long pods, black seeds and sweet taste makes this asparagus bean a culinary asset.

Benefits and applications

Vigna unguiculata 'Metro Black' offers several advantages:

1. Culinary – long, sweet pods that can be eaten young.

2. Decorative – vigorous climber with long pods and showy flowers.

3. Pollinator-friendly – ​​attracts bees and butterflies, promoting biodiversity.

4. Warm locations – ideal for south-facing gardens and balconies.

5. Versatile – perfect for stakes, pergolas, trellis or large pots.

These properties make 'Metro Black' a great choice for organic vegetable gardens, warm patio gardens and decorative garden projects.