Purple Basil Dark Opal
Dark Opal Basil is a stunning purple-leafed variety of sweet basil, prized for its ornamental beauty and mildly spicy, clove-like flavor. Ideal for culinary use, herbal tea blends, and edible landscaping, it also attracts pollinators and looks beautiful in containers or garden beds.
Quick Facts
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Botanical name: Ocimum basilicum ‘Dark Opal’
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Common name: Purple Basil, Dark Opal Basil
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Plant type: Warm-season annual herb
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Days to maturity: 60–70 days
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Height: 12–18 inches
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Sun exposure: Full sun
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Hardiness zones: USDA 4–11 (as annual)
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Spacing: 10–12 inches apart
When to Plant
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Indoors: Start seeds 6–8 weeks before the last frost.
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Outdoors: Transplant when soil warms and nighttime temps stay above 55°F (13°C).
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Germination time: 5–10 days at 70–85°F (21–29°C)
How to Plant
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Soil preparation: Well-drained, fertile soil rich in organic matter. Ideal pH: 6.0–7.5.
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Sowing depth: 1/4 inch deep; barely cover seeds.
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Watering: Keep soil moist during germination; water at base once established.
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Fertilizing: Light feeding with organic herb fertilizer every 3–4 weeks.
Growing Tips
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Pinch tips regularly to encourage bushier growth and prevent early flowering.
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Remove flower buds to extend leaf production and improve flavor.
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Grows well in containers, garden beds, and kitchen herb gardens.
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Can be grown indoors on a sunny windowsill.
Harvesting
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Begin harvesting once plants have 6–8 leaves.
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Pick leaves in the morning for best flavor.
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Harvest often to promote continued growth.
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Leaves can be used fresh or dried.
Culinary Use
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Great for salads, pesto, vinegars, pasta dishes, herb butter, and garnishes.
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Adds visual appeal and subtle spice to dishes.
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Can be brewed into tea or used to infuse oils.
Companion Plants
Pairs well with tomatoes, peppers, lettuce, and oregano.
Avoid planting near rue or sage.
Why Grow Dark Opal Basil?
With its deep purple foliage, Dark Opal Basil is both beautiful and useful — adding color to the garden and flavor to the kitchen. It’s a favorite for ornamental herb gardens, container arrangements, and chefs who love both taste and presentation.