Ocimum basilicum 'Dark Opal' – the graceful purple basil

Ocimum basilicum , commonly known as basil, is one of the most popular culinary herbs in the world. Within this species, the cultivar 'Dark Opal' is particularly striking for its deep purple leaves, which not only offer a strong flavor but also add decorative value to the garden. 'Dark Opal' combines flavor, health, and aesthetics in one versatile plant, making it ideal for gardeners, chefs, and herb lovers in pots and borders.

Description and growth habit – elegant and aromatic

Ocimum basilicum 'Dark Opal' is a bushy annual plant that grows to an average height of 30–50 cm. Its deep purple, almost black leaves create a beautiful contrast with other green herbs and flowers in the garden. Besides their striking color, the leaves have a classic basil flavor: aromatic, slightly sweet, and peppery, perfect for a wide variety of dishes.

During the summer, the plant produces bright flowers, usually purple or white, that attract insects such as bees and butterflies. The fine-leaved, aromatic foliage and compact growth habit make Dark Opal ideal for herb gardens, pots, borders, or cutting gardens, where it is both functional and ornamental.

Culinary applications – taste and color in the kitchen

Basil 'Dark Opal' offers the same culinary versatility as green basil, but with an added visual impact. The purple leaves are suitable for:

• Salads and vegetable dishes

• Pesto and herb mixes

• Pasta and rice dishes

• Drinks and decorative garnishes

Adding purple basil not only adds flavor to dishes but also creates a striking presentation. The leaves can be used fresh or lightly cooked. Furthermore, 'Dark Opal' can be used in dried herbs or herbal oil, preserving some of its color and aroma.

Medicinal and aromatic use

Besides its culinary uses, basil is traditionally valued for its aromatic and mild medicinal properties. The leaves contain essential oils such as linalool and eugenol, which have anti-inflammatory and refreshing properties. Basil is therefore sometimes used to aid digestion, promote relaxation, or as an aromatic herb in tea blends.

Cultivation and care – easy and profusely flowering

Ocimum basilicum 'Dark Opal' is relatively easy to grow, both in the ground and in pots. Some growing tips:

• Sowing: From March to May indoors or directly in the open ground.

• Location: Sunny, warm, and sheltered. Basil doesn't like the cold.

• Soil: Well-drained, nutritious and slightly moist.

• Maintenance: Regular topping encourages bushy growth and prevents early flowering.

The plant blooms from summer to early autumn. Regular harvesting keeps the leaves young, tender, and aromatic. 'Dark Opal' can also be grown in mixed pots or herb baskets, which is ideal for balconies or smaller gardens.