‘Dark Opal’ is an annual spice basil variety with strikingly dark purple leaves, highly valued in both culinary arts and ornamental gardening. The plant emits a strong and pleasant aroma, and its leaves have a characteristic slightly bitter, richly spicy flavor. This purple basil is an excellent addition to fresh salads, meat dishes, and marinades, and its vibrant leaves are also ideal for visually enhancing dishes.
Thanks to its compact growth, ‘Dark Opal’ easily adapts to a wide variety of conditions. It can be successfully grown outdoors in an herb garden, in a greenhouse, in a balcony box, or even year-round on a sunny kitchen windowsill. Due to its decorative appearance, this variety is also perfectly suited for planting among summer flowers, offering an exciting color contrast in the garden.
Usage and Cultivation Instructions:
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Sowing Time: For indoor pre-cultivation, sow seeds from February to May. Direct sow outdoors or into outdoor pots only in late May or June, once the soil has warmed and the risk of night frost has completely passed.
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Location: Prefers a warm, sheltered, and sunny location with fertile, well-drained soil.
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Sowing Depth: Sow seeds thinly on the surface of moist soil and cover with only a very thin layer of soil (up to 0.5 cm), as they require warmth and light for germination.
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Spacing: When transplanting (in June), leave approximately 15 x 15 cm between plants.
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Harvest: Fresh leaves can be harvested from March to August. Regularly cut leaves and shoot tips; this promotes branching and the growth of new leaves.
Tips and recommendations:
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Basil is an extremely cold-sensitive plant. Do not rush to move plants outdoors – do so only when night temperatures consistently remain above +10 °C.
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To ensure a richer leaf harvest and extend its lifespan, consistently pinch off developing flower buds. When it blooms, the leaves become duller, and the stems lignify more quickly.
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When growing on a windowsill, ensure the plant receives sufficient natural light. In low light conditions, stems tend to stretch, and the intense purple color of the leaves may become greener.