Cosmos Sensation Radiance
Cosmos Sensation Radiance
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300 seeds
🗓️ When to Sow
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Indoors: Start 4–6 weeks before last frost.
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Outdoors: Sow directly after the last frost, once soil warms (above 15°C / 60°F).
🌱 How to Sow
Option 1: Direct Outdoor Sowing (Recommended)
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Prepare Soil
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Choose a site with full sun and well-drained soil.
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Cosmos tolerate poor soil but dislike overly rich, wet conditions.
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Sow Seeds
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Depth: ¼ inch (6 mm).
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Spacing: Sow thinly, then thin seedlings to 12–18 inches (30–45 cm) apart.
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Watering
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Water gently after sowing.
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Keep soil moist until seedlings emerge (but not soggy).
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Germination
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Time: 7–10 days
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Ideal temperature: 65–70°F (18–21°C)
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Option 2: Indoor Sowing
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Use pots or seed trays filled with light seed-starting mix.
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Sow seeds ¼ inch deep.
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Keep moist and warm (65–70°F) until germination.
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Provide bright light once seedlings emerge.
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Harden off seedlings before transplanting outside.
🌿 After Germination
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Thin or transplant to 12–18 inches apart.
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Cosmos grow quickly and bloom around 60–75 days from sowing.
🌼 Growing Notes
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Sun: Full sun (6+ hours/day).
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Soil: Light, well-draining; avoid high-fertility soil to prevent leggy growth.
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Water: Drought-tolerant once established; water during dry spells.
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Deadheading: Prolongs blooming, but can also allow some to go to seed for self-sowing.
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Height: 'Sensation Radiance' can grow 3–4 feet (90–120 cm) tall — may need staking in windy areas.
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