For optimal germination rates, initiate seed propagation indoors under controlled conditions—unless the species exhibits a high sensitivity to root disturbance. This approach allows precise regulation of temperature, humidity, and light, improving germination consistency and seedling viability. Do not skip any recommended seed treatments, as they are essential for uniform and successful germination.
⚠️ Keep soil evenly moist during germination. DO NOT LET IT DRY OUT — once seeds begin absorbing water (imbibition), drying can kill the seed embryo, and even brief dryness after sprouting can kill seedlings.
?When to Sow Indoors: Sow indoors 6–8 weeks (42–56 days) before your last expected frost date.
Optimum Germination Temperature: Use a heat mat to maintain steady temperatures of 18–22 °C (64–72 °F)
Germination Time: up to 21 days
Light Requirements for Germination
Light is required — seeds must be surface-sown.
Use grow lights to maintain 12–16 hours of light per day.
How to Sow Indoors
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Use a fine, well-draining seed-starting mix
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Scatter seeds evenly on the soil surface
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Do not cover the seeds — gently press them into the soil
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Mist lightly to settle seeds without burying them
Humidity: Use a humidity dome or clear cover to maintain consistent moisture during germination. Open the dome BRIEFLY once per day to allow fresh air in and reduce mold risk. Remove the dome entirely once seedlings emerge.
Post-Germination Care
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Once seedlings appear, provide bright light and good air circulation
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Keep soil lightly moist, never waterlogged
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Transplant carefully once seedlings have several true leaves
Final plant spacing: 20–30 cm (8–12 in)
Plant type: Annual flowering herb
Mature height: 30–60 cm (12–24 in)
Growing Tips
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Prefers full sun but tolerates light shade
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Thrives in poor to moderately fertile soil — avoid heavy feeding
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Regular harvesting of flowers encourages continued blooming
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Ideal for herb gardens, pollinator gardens, and containers
More guides at: bloomoutlet.com/seed-guides